Is the curve relating temperature to aggression linear or curvilinear? A response to Bell (2005) and to Cohn and Rotton (2005).

P. Bell (2005) recommended examining the relationship between temperature and assaults during the hottest times of day and during the hottest months of the year. The authors' analyses of these data show a linear rather than inverted U-shaped relationship between temperature and assault during the hottest times of day and in the hottest months of the year. E. Cohn and J. Rotton (2005) recommended analyzing the 6 hr with the highest assaults versus the 6 hr with the lowest assaults. During high assault periods, there is a strong positive linear relationship between temperature and assault. During low assault periods, there is no relationship between temperature and assaults. Assaults and other violent crimes might decrease when temperatures are very hot, but the Minneapolis data set does not allow for testing of this hypothesis because Minneapolis is too cold. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Assault as a function of time and temperature: A moderator-variable time-series analysis.

The authors hypothesized that relations between temperature and assaults are stronger during evening hours than during other hours of the day and tested this hypothesis by obtaining 3-hr measures of assaults, temperature, and other weather variables for a 2-year interval. The hypothesis was confirmed by autoregression analyses that controlled for secular trends, seasonal differences, other weather variables, holidays, and other calendar events. In addition, as predicted by the negative affect escape model, assaults declined after reaching a peak at moderately high temperatures. The inverted U-shaped relation survived tests that controlled for secular trends, seasonality, autocorrelation, outliers, and heteroscedasticity. In addition, consistent with routine activity theory, moderator-variable regression analyses indicated that relations were strongest during evening hours and on weekends. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Is the Curve Relating Temperature to Aggression Linear or Curvilinear? Assaults and Temperature in Minneapolis Reexamined.

Using archival data from Minneapolis recorded in 3-hr time intervals, E. G. Cohn and J. Rotton (1997) concluded that there is an inverted U-shaped relationship between temperature and assault, with the maximum assault rate occurring at 74.9 °F. They depicted this relationship by plotting temperature against assault. This plot, however, fails to take into account time of day. Time of day was strongly related to both temperature and assault, but in opposite directions. Between 9:00 p.m. and 2:59 a.m. of the next day, when most assaults occurred, there was a positive linear relationship between temperature and assault. The Minneapolis data actually provide stronger support of a positive linear (or monotonic) relationship between temperature and assault than of an inverted U-shaped relationship. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The curve is still out there: A reply to Bushman, Wang, and Anderson's (2005) "Is the curve relating temperature to aggression linear or curvilinear?"

This article replies to research conducted by B. J. Bushman, M. C. Wang, and C. A. Anderson (2005) and demonstrates that the results of prior research by E. G. Cohn and J. Rotton (1997) do support the existence of a curvilinear relationship between temperature and aggression when time of day is taken into consideration. The shape of the relationship between temperature and aggression also depends on a number of other factors, including season, amount of social interaction, type of violence, and type of setting. It appears that linear relationships between temperature and aggression identified by B. J. Bushman et al. (2005) are less ubiquitous than might be believed and that the curve is still out there. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Daily negative mood affects fasting glucose in Type 2 diabetes.

Objective: To examine the relationship between mood and blood glucose in a 21-day daily diary study. Design: During a home visit, information was gathered from 206 persons with Type 2 diabetes regarding demographics, disease characteristics and treatment, and depressive symptoms. They had blood drawn at a laboratory, yielding HbA1C. The participants were then telephoned each evening for 21 days and were asked about their positive and negative mood during the past 24 hours. They also tested their blood glucose upon rising in the morning. Main Outcome Measures: The main outcomes measures were positive and negative affect and fasting glucose. Results: Multilevel analyses revealed a relationship between negative affect on one day and morning glucose on the next day. There was no such relationship between positive affect and glucose, nor was there a comparable effect of glucose on one day and either positive or negative affect on the next day. Conclusion: The observed relationship between mood and blood glucose appears to be because of negative affect, not positive, with no evidence of a lagged effect of glucose on mood. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Temporal relationship between basal body temperature nadir and luteinizing hormone surge in normal women

Basal body temperature (BBT) as a predictor of ovulation was assessed by examining the temporal relationship between the BBT shift and the luteinizing hormone (LH) surge in individual cycles of 27 normal women. For 22 of the subjects, the LH surge occurred on the same day or within one day of the BBT nadir. For the remaining five subjects, the surge fell within 2 days after or 3 days before the nadir. Despite the BBT nadir's close temporal association with the LH surge, daily examination of BBT for the purpose of predicting the day of ovulation during a given cycle is unsatisfactory. By 48 hours following the nadir, when one could usually be certain that temperature elevation had occurred, all subjects had already exhibited the LH surge.     

Characterization of dentatorubral-pallidoluysian atrophy proteins using two-dimensional electrophoretic analysis

The relationship between the daily oral dose of the benzamide amisulpride and the striatal D2-dopamine receptors occupancy was investigated in 11 schizophrenic patients using positron emission tomography with 76Br-bromolisuride. The patients were studied before and during chronic treatment with amisulpride over a wide range of doses. The test-retest variability of the method was estimated to be 5.8% in a group of four patients receiving placebo. A curvilinear relationship was demonstrated between the amisulpride doses and the D2-receptor occupancy. A range of 70-80% occupancy of the striatal D2 receptors, suggested as an optimal interval for therapeutic action on positive psychotic symptoms, was obtained with doses of amisulpride ranging between 630 and 910 mg per day, while an occupancy of 85%, suggested to be associated with pronounced extrapyramidal side-effects, was reached with 1,100 mg per day.     

Anti-IL-4 antibody inhibits antigen specific IgE response but fails to prevent chicken gamma globulin-induced active systemic anaphylaxis: evidence for the involvement of IgG antibodies

Liver core temperature during organ procurement, storage, and rewarming has not been reported in human orthotopic liver transplantations (OLT). We have shown in the rat that optimal temperature for liver storage is not 4 degrees C but 0 degree C to 1 degree C. Therefore, a study was undertaken in humans and in pigs to determine the pattern of temperature change during OLT. The porcine studies were performed, because it was not possible to follow human grafts during the period that they were sterilely packaged. Temperature depression in humans was rapid during organ perfusion, remained stable during organ dissection, and decreased again slightly, when after excision, the organ was perfused again. Temperature depression during the period of perfusion with University of Wisconsin (UW) solution was curvilinear with the initial rapid temperature depression followed by a period of slower temperature depression. Volume perfused versus time was linear during these periods and the relationship between temperature depression and volume infused was curvilinear. At the time of packaging, 65 +/- 12 minutes after start of cold perfusion, the liver core temperature was 5.7 degrees C +/- 1.3 degrees C. Studies in the pig showed that it took 75 to 100 minutes for liver core temperature to decrease below 5 degrees C, and core temperature reached a plateau at 1 degree C at 195 +/- 75 minutes after packaging. During the rewarming period in humans, while vascular anastomoses were being constructed, there was a rapid linear increase in temperature from 0.8 degree C, when the graft was removed from the cold, to 17.2 degrees C +/- 3.1 degrees C at 45.5 +/- 4.4 minutes later, just before portal reperfusion commenced. These studies show that it takes only a short time to cool livers down to 10 degrees C, but after flushing is stopped, temperature depression is markedly reduced, and ideal temperatures are not reached before packaging. Rewarming of livers during performance of vascular anastomoses is rapid and reaches temperatures at which substantial hepatic metabolism is occurring.     

Misleading interaction and curvilinear terms.

This article examines the relationships between interaction (product) terms and curvilinear (quadratic) terms in regression models in which the independent variables are correlated. The author uses 2 substantive examples to demonstrate the following outcomes: (a) If the appropriate quadratic terms are not added to the estimated model, then the observed interaction may indicate a synergistic (offsetting) relationship between the independent variables, whereas the true relationship is, in fact, offsetting (synergistic). (b) If the appropriate product terms are not added to the equation, then the estimated model may indicate concave (convex) relationships between the independent variables and the dependent variable, whereas the true relationship is, in fact, convex (concave). (c) If the appropriate product and quadratic terms are not examined simultaneously, then the observed interactive or curvilinear relationships may be nonsignificant when such relationships exist. The implications of these results for the examination of interaction and quadratic effects in multiple regression analysis are discussed. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Air pollution, weather, and violent crimes: Concomitant time-series analysis of archival data.

Archival data covering a 2-yr period were obtained from 3 sources to assess relations among ozone levels, meteorological conditions, day of the week, holidays, seasonal trends, family disturbances, and assaults against persons. Sources for the data were (1) logged calls to police for assistance in assaults and other family and household disturbances, (2) 1-hr readings for ozone by an environmental protection agency, and (3) meteorological conditions published by the National Oceanic and Atmospheric Administration, which included percentage of sunshine; 24-hr averages for temperature, relative humidity, barometric pressure, and wind speed; fog; thunderstorms; and smoke/haze. More family disturbances were recorded when ozone levels were high than when they were low. Two-stage regression analyses indicated that disturbances and assaults were also positively correlated with daily temperatures and negatively correlated with wind speed and levels of humidity. Analyses indicated that high temperatures and low winds preceded violent episodes, which occurred more often on dry than humid days. Assaults followed complaints about family disturbances, which suggests that the latter could be used to predict and lessen physical violence. It is concluded that atmospheric conditions and violent episodes are not only correlated but also appear to be linked in a causal fashion. (65 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Determination of thermoregulatory state in full-term infants

A series of nine sets of axillary and tympanic (core) temperature readings were collected from each of 45 full-term infants during the first 4 hours after birth. The pattern of readings and the relationship between axillary and tympanic temperature readings were examined in each infant to determine whether the type of thermal state could be detected and categorized. The findings support the supposition that different thermal states are present and can be determined by the relationship between tympanic and axillary temperature readings. The ability to predict tympanic temperature decrease could not be predicted through examination of axillary-tympanic temperature patterns.     

In defense of the negative affect escape model of heat and aggression.

Counters C. A. Anderson's (see record 1989-36724-001) interpretation of data allegedly inconsistent with the curvilinear negative affect escape model of temperature and aggression. Anderson suggests that archival studies support a rectilinear rather than curvilinear model as temperature increases from comfortable to hot and that inconsistencies surrounding curvilinearity lab studies should be resolved in favor of linearity. To the contrary, this article asserts that archival region and time period studies are inconsistent themselves, that most of them are inadequate for testing curvilinearity, and that some of them are consistent with curvilinearity. Moreover, concomitant lab and field studies also provide evidence for a curvilinear relationship that is as robust as the linear relationship ostensibly is in archival studies. Thus, there is much more support for the negative affect escape model, and much less evidence against it, than Anderson has suggested. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Use of the NOSIE to predict assaults among acute psychiatric patients. Nurses' Observational Scale for Inpatient Evaluation

OBJECTIVE: The study evaluated the Nurses' Observational Scale for Inpatient Evaluation (NOSIE), the Brief Psychiatric Rating Scale (BPRS), the Mini Mental State Examination (MMSE), and other measures as predictors of assaults that occurred during psychiatric hospitalization. METHODS: On admission, the MMSE was administered to 335 acutely ill psychiatric patients, and diagnostic and demographic data were recorded. Immediately after admission, patients were rated by nurses using the NOSIE and by psychologists using the BPRS. Patients who committed assaults during hospitalization (N = 47) and those who did not were compared, and relationships between several variables and assaults were evaluated by t tests, Mann-Whitney U tests, chi square tests, and analyses of variance. RESULTS: A high score on the irritability factor of the NOSIE and failure to complete the MMSE correctly predicted the occurrence or nonoccurrence of assault 81 percent of the time. None of the other variables examined were significantly related to assaults, including total scores on the BPRS and MMSE, psychiatric diagnosis, and several demographic variables. CONCLUSIONS: Scores on a test of distress level shortly after admission and failure to complete the MMSE on admission can help the clinician predict who will later engage in an assault.     

Rethinking the effects of stressors: A longitudinal study on personal initiative.

This study examined the relationship between stressors at work and personal initiative (PI), one proactive concept of extra-role performance. Using a control theory framework to describe the stress process, the authors hypothesized that stressors should be positively related to PI. This departs from findings of negative relationships between stressors and other types of performance. Furthermore, curvilinear relationships were tested. The analyses, based on 4 measurement waves of a longitudinal field study with 172 to 193 participants, showed that stressors were positively related to subsequent changes in PI; there was no support for a curvilinear relationship. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The flavonoids of Allium ursinum

Recent research has linked sexual assaults with disordered eating behaviors. Whether the relationship of the perpetrator, intrafamilial or extrafamilial affects the development of disturbed eating is not known. Using data from 190 university women, we found that women with histories of intrafamilial assaults were more likely to suffer a serious eating problem (17 of 36 subjects, 47%) than women who had no history of sexual assault (30 of 142 subjects, 21%) and women who only reported extrafamilial assaults (76 of 212 subjects, 36%,).     

Stress at work: Linear and curvilinear effects of psychological-, job-, and organization-related factors: An exploratory study of trinidad and tobago.

In this study, the authors operationalized job stress as a two-dimensional construct consisting of time pressure and anxiety. The authors hypothesized that the relationship between job stress and job-related attitudes such as job involvement and job satisfaction would be curvilinear but would be linear with psychosomatic problems. In addition, the authors proposed that attitudinal factors would mediate the relationship between job stress and organizational commitment. Data were obtained from 241 respondents in Trinidad and Tobago. Our findings revealed that curvilinear relationships were supported for anxiety and the outcome variables but not for time pressure. The results also provided full support for our mediation hypotheses in the case of anxiety. However, partial support for mediation was obtained for time pressure. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Time of occurrence of paroxysmal atrial fibrillation in Holter monitoring in patients with coronary heart disease and in patients with hypertension

Paroxysmal atrial fibrillation (PAF) often accompany coronary heart disease (CHD), and primary hypertension (PH). The aim of the study was to evaluate the time of occurrence and duration of paroxysmal atrial fibrillation (PAF) identified from Holter recordings in 63 patients (27 women and 36 men) with CHD (n = 45) and PH (n = 18). No pharmacological treatment was applied before and during the examination. All patients were in sinus rhythm at the start and the end of the recording which lasted for 24 hours. PAF were defined as the occurrence of at least four beats of supraventricular origin, with no visible P or flutter waves. The time of onset, duration, ventricular rate and symptoms of each PAF were noted. There were 219 paroxysms recorded in 63 patients which occurred more often by day than by night, the time of duration was 0.9-240 s. Of the total, 16.3% of episodes with CHD and 9.5% episodes in patients with PH occurred between the hours 8:00-10:00 and between 16:00 and 18:00; 9.1% and 21% respectively. We concluded that in patients with CHD and with H most of the episodes (95%) are silent, they occurred more often during the day activity (particularly between the hours of 8:00 and 10:00 and 16:00-18:00 in both groups). In patients with CHD we observed the third peak of occurrence of PAF between the hours 22:00-0:00.     

Uterine pressure-flow relationships during early gestation

Placental and myoendometrial pressure-flow relationships were determined in 17 gravid ewes between 29 and 110 gestational days with the use of radioactive-labeled microsphere injections under flow meter guidance. Myoendometrial relationships were consistently curvilinear with convexity toward the flow axis. From 29 to 40 days, caruncular-cotyledonary relationships were similar to myoendometrial ones. After 50 days, the relationship was slightly but significantly curvilinear with convexity toward the pressure axis. From 42 to 50 days, responses were intermediate. The changes in caruncle-cotyledon vascular reactivity correlated with the onset and maturation of interdigitation of fetal and maternal tissues during definitive placentation. A hypothesis for these changes in vascular reactivity is presented.     

Stage I ovarian cancer by transvaginal color Doppler sonography: a report of 18 cases

PURPOSE: To evaluate the tolerability and 24 hours efficacy of a new anti-hypertensive drug: cilazapril. METHODS: In an open non comparative study 20 hypertensive patients (16 females, age from 30 to 60 years, average = 49.4) were followed for 6 weeks: 2 wash out and 4 treatment (5 mg OD). Blood pressure (BP) was measured by casual and ambulatory blood pressure monitoring (ABPM) readings. RESULTS: Comparing washout and treatment periods, ABPM averages both for systolic and diastolic BP (mmHg) showed significant decrease in 24 hours, during day and night sub periods. The decrease was not significant between averages considering the "early morning rising pressure" sub period. Heart rate averages showed significant reduction at all sub periods except during night. Adverse effects were mild and resolved spontaneously (n = 3, 15%). CONCLUSION: Cilazapril seems to be efficacious as antihypertensive. Tolerability is excellent. It preserved circadian rhythm despite significantly reducing blood pressure at all periods evaluated except early morning. A bradycardic effect observed mostly during day period should be better evaluated.     

The relationship between glycemic control and health-related quality of life in patients with non-insulin-dependent diabetes mellitus

The relationship between glycemic control and health-related quality of life was examined in patients with non-insulin-dependent diabetes mellitus (NIDDM). Within the context of a randomized controlled trial, 275 patients with NIDDM receiving primary care from a Veteran's Administration general medical clinic were enrolled and monitored for 1 year. Glycemic control (glycosylated hemoglobin levels) and health-related quality of life (Medical Outcomes Study Short-Form 36-item Health Survey [SF-36]) were assessed at baseline and at 1 year. Multivariate regression modeling using baseline and change scores during a 1-year period did not find a linear or curvilinear relationship between glycosylated hemoglobin and SF-36 scores (P = .15); this was true even after controlling for five covariates identified a priori (insulin use, number of diabetic complications, duration of diabetes, education, number of hyper-, or hypoglycemic episodes during the preceding month). Health services researchers and clinicians alike need to be aware that these two important outcomes may not be directly related. This lack of association could contribute to the high noncompliance rates observed among patients prescribed complex diabetic regimens. Unless patients perceive a benefit from following such regimens, good glycemic control may continue to be an elusive therapeutic goal, especially in patients with long-standing disease.