The Sleep Disturbance Scale for Children (SDSC). Construction and validation of an instrument to evaluate sleep disturbances in childhood and adolescence

To attempt a categorization of sleep disorders in children, we developed a 27 item Likert-type rating scale (Sleep Disturbance Scale for Children: SDSC) and assessed the psychometric properties was developed. The scale was distributed to the mothers of 1304 children (1157 controls, mean age 9.8 y; 147 sleep disorder subjects, mean age 9.2y, composed of four clinical groups: Insomnia 39 subjects, Hypersomnia 12 subjects, Respiratory disturbances during sleep 25 subjects and Parasomnias 71 subjects). The internal consistency was high in controls (0.79) and remained at a satisfactory level in sleep disorder subjects (0.71); the test/retest reliability was adequate for the total (r = 0.71) and single item scores. The factor analysis (variance explained 44.21%) yielded six factors which represented the most common areas of sleep disorders in childhood and adolescence. Enuresis was the only item with a factor loading lower than 0.40 and with a low inter-item correlation and was therefore eliminated, resulting in a final scale of 26 items. The re-evaluation of the sample, using the factor scores, supported the validity and the discriminating capacity of the scales between controls and the four clinical groups. The correlation between factor scores corroborated the hypothesis that childhood sleep disturbances are not independent entities nor do they cluster into different groupings related to each other. The SDSC appears to be a useful tool in evaluating the sleep disturbances of school-age children in clinical and non-clinical populations.     

A cross-validation of the European Organization for Research and Treatment of Cancer QLQ-C30 (EORTC QLQ-C30) for Japanese with lung cancer

The EORTC QLQ-C30 was developed in English-speaking cultures. To determine if this instrument could cross a broad cultural divide and be used in Japan, the cross-cultural validity of its Japanese version was estimated. In evaluating psychometric testing, internal consistency by Cronbach's alpha, item-discrimination by multitrait scaling analysis, and validity analysis with ECOG performance score (PS) and Karnofsky Performance Status Scale (KPS) were performed. The QLQ-C30 (version 1.0) was given to 105 patients with lung cancer. Although the response rate was low in patients with PS 4, the questionnaire was well accepted by patients with PS 0-3. The Japanese QLQ-C30 has a weak scale of role functioning in terms of item discriminative validity. It also has a weak scale of cognitive functioning in items of discriminative validity and internal consistency. However, known-groups comparison showed the expected clinical validity with PS for all the scales except for financial impact, and longitudinally clinical validity with KPS was shown in scales of cognitive functioning, fatigue, and nausea and vomiting. Multitrait scaling analysis showed that the predicted scales constituting quality of life (QOL) in the English-speaking culture were extracted from the Japanese QLQ-C30, and found to be valid in Japan, indicating its possible usefulness as an instrument that is universally applicable across cultures.     

Adaptation and psychometric properties of the German version of the Dissociative Experience Scale

We introduce the 'Fragebogen zu Dissoziativen Symptomen' (FDS), a German adaptation of the Dissociative Experience Scale (DES) which was developed to screen for dissociation within an ICD-10 framework. In addition to the original 28 DES items, the FDS contains 16 items covering dissociative phenomena included in the ICD-10, particularly pseudoneurological conversion symptoms. The psychometric properties of the FDS were studied in 927 clinical and nonclinical subjects from different diagnostic groups and compared to results of American studies. The scale had good test-retest reliability of .88, high internal consistency (split-half = .90, Cronbach's alpha = .94) and good construct validity. These results indicate that the FDS may be a valuable screen for dissociative psychopathology in German-speaking countries.     

Development and Psychometric evaluation of an instrument to measure staff nurses' perception of uncertainty in the hospital environment

Perceived environmental uncertainty is an individual response to stimuli in the internal and/or external environment. The measurement of uncertainty in the health care environment is important in order to characterize the impact of this phenomenon on nursing practice. This study describes the development, pilot testing, and initial psychometric evaluation of the Perceived Environmental. Uncertainty in Hospitals Scale (PEU-H) in a sample of 95 hospital staff registered nurses. Principal components analysis of the PEU-H was conducted and indicated that the factor structure represented one factor that explained 37.3% of the variance. Internal consistency reliability using Cronbach's alpha was .83, which is acceptable for a scale in the early stages of development.     

Validation of a diabetes-specific quality-of-life scale for patients with type 1 diabetes

OBJECTIVE: To validate a diabetes-specific quality-of-life scale and to assess its psychometric properties in a large sample of patients with type 1 diabetes. RESEARCH DESIGN AND METHODS: To assess the quality of diabetes care in a population-based study, a representative sample of 684 patients with type 1 diabetes was examined. A total of 657 patients (42% female; mean age 36 years; mean diabetes duration 18 years) completed the diabetes-specific quality-of-life scale (DSQOLS), which comprised 64 items on individual treatment goals (10 items), satisfaction with treatment success (10 items), and diabetes-related distress (44 items). Statistical examinations covered factor analysis, internal consistency of subscales, and construct and discriminant validity. RESULTS: Factor analysis of the 44 items on diabetes-specific burdens revealed six reliable components (Cronbach's alpha): social relations (0.88), physical complaints (0.84), worries about future (0.84), leisure time flexibility (0.85), diet restrictions (0.71), and daily hassles (0.70). All six subscales were significantly correlated with a validated well-being scale (r = -0.35 to -0.53, P < 0.001) and treatment satisfaction (r = 0.28 to 0.43, P < 0.001). Physical complaints (r = 0.24) and worries about future (r = 0.17) showed the highest correlations with HbA1c (P < 0.001). A flexible insulin therapy, a liberalized diet, the absence of late complications, and a higher social status were significantly associated with more favorable scores in different domains. CONCLUSIONS: The DSQOLS is a reliable and valid measure of diabetes-specific quality of life. The scale is able to distinguish between patients with different treatment and dietary regimens and to detect social inequities. Use of the DSQOLS for assessment of individual treatment goals as defined by the patients may be helpful to identify motivational deficits and to tailor individual treatment strategies.     

Cloning and characterization of the CDKN2A and p19ARF genes from Monodelphis domestica

The psychometric properties of the Belgian Dutch and French translations of the SF-36 Health Survey were evaluated in a sample of 4448 Belgian patients with angina enrolled in a 6-month treatment study. Missing data were rare (<2%), and tests of both item internal consistency and item discriminant validity were satisfactory in both languages. Cronbach's alpha coefficient ranged from 0.81 to 0.91 (Dutch) and 0.82 to 0.92 (French). SF-36 scales discriminated between groups of patients differing in age and in the number of weekly angina attacks, change over 6 months in the number of weekly angina attacks and physician assessment of change in physical condition both were significantly related to changes in SF-36 scale scores. On average, scale scores for French-speaking patients were lower than for Dutch-speaking patients, most notably for Vitality and Mental Health. The average change in SF-36 scale scores over 6 months, in relation to change in clinical criteria, was similar in both language groups. The psychometric properties of the Belgian Dutch and French translations should be tested further in Belgium to determine whether the generally favorable results reported here can be replicated in other samples.     

Preschool and primary locus of control scale: Is it ready for use?

Two experiments investigated the psychometric properties of the Preschool and Primary Nowicki-Strickland Internal–External Control Scale (PPNS-IE). The test was administered to 286 lower-middle-class and 158 middle-class 1st–3rd graders. Test administration procedures differed somewhat for 1 sample; they were identical to original procedures for the 2nd sample. Although all items met the standard endorsement frequency criterion, no item reached minimal levels of internal consistency in either sample. Factor-analytic procedures provided no evidence of reliable subscales. A reexamination of the data reported by S. Nowicki and M. P. Duke (see record 1975-04954-001) showed that even with their sample, many of the items failed to reach minimal levels of reliability. Further scale development should be pursued before the external validation of the PPNS-IE is attempted. (10 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

What constitutes cerebral palsy?

OBJECTIVE: To determine whether a newly developed disability scale for patients with neck pain demonstrated acceptable reliability and validity. METHODS: Testing was conducted using three different samples of patients with neck pain (n = 162). Test-retest reliability of the scale was carried out on the same day with one sample (n = 39), and between-day reliability was carried out with another (n = 21). Differential item functioning with regard to the influence of gender and age was carried out with these two patient groups, as was construct validity. Responsiveness was measured using patients participating in a clinical trial involving patients with chronic neck pain (n = 102). Additionally, scale scores were compared with a wide range of physical measurements using the patients in the clinical trial. RESULTS: Short-term, between-day and postal questionnaire reliability coefficients were all extremely high. The Cronbach's alpha coefficient for internal consistency was 0.9 for the entire scale, and the coefficients for individual items were all greater than 0.88. Disability scale scores correlated strongly to pain scores as well as to doctor and patient global assessments, indicating good construct validity. Relative changes in disability scores demonstrated a moderately strong correlation to changes in pain scores after treatment. Scale scores correlated weakly to all physical measurements. CONCLUSIONS: The disability scale demonstrated excellent practicality and reliability. The scale accurately reflects patient perceptions regarding functional status and pain as well as doctor's global assessment and is responsive to change over long periods of time. We feel that this scale can be a valuable tool for the assessment of patients in future clinical trials and quality of care studies.     

An inventory for measuring clinical anxiety: Psychometric properties.

The development of a 21-item self-report inventory for measuring the severity of anxiety in psychiatric populations is described. The initial item pool of 86 items were drawn from three preexisting scales: the Anxiety Checklist, the Physician's Desk Reference Checklist, and the Situational Anxiety Checklist. A series of analyses was usd to reduce the item pool. The resulting Beck Anxiety Inventory (BAI) is a 21-item scale that showed high internal consistency (α?=?.92) and test–retest reliability over 1 week, r(81)?=?.75. The BAI discriminated anxious diagnostic groups (panic disorder, generalized anxiety disorder, etc.) from nonanxious diagnostic groups (major depression, dysthymic disorder, etc.). In addition, the BAI was moderately correlated with the revised Hamilton Anxiety Rating Scale, r(150)?=?.51, and was only mildly correlated with the revised Hamilton Depression Rating Scale, r(153)?=?.25. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Factor structure and validation of an adolescent version of the Condom Attitude Scale: An instrument for measuring adolescents' attitudes toward condoms.

The Condom Attitude Scale (W. P. Sacco, B. Levine, D. L. Reed, & K. Thompson, 1991) was modified for use with adolescents. In Study 1, a modified 35-item version, pilot tested with 195 African American adolescents, achieved a Cronbach's alpha of .88. In Study 2, convergent validity was assessed with a sample of 312 African American adolescents. Psychometric properties were evaluated with item analysis, factor analysis, and reliability estimation. The scale was refined to 23 items with a full scale Cronbach's alpha of .80. In Study 3, temporal stability was assessed with 88 African American adolescents. In Study 4, a cross-validation sample of predominantly White adolescents (N?=?2) assessed whether the measure's psychometric properties and factor structure replicated in a more heterogeneous adolescent sample. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Need we measure anxiety differently for males and females?

Using 2 separate large samples of children (N1 = 957 and N2 = 3,885) and 1 smaller sample of adolescents and adults (N3 = 416), 3 studies of item selection for measurement of anxiety were conducted to determine if item selection differed across gender when traditional psychometric methods were applied. Applying a common set of item selection rules for males and for females, the same items were selected for inclusion on various measures of anxiety with differing item-response formats with comparable internal consistency reliability obtained using separate gender and combined gender samples. Standard psychometric methods indicate anxiety is measured in males and females about equally well and by essentially the same items.     

Tumor necrosis factor-beta in human pregnancy and labor

Findings are reported from a replicated evaluation of the psychometric properties of the Organizational Job Satisfaction Scale. Data lend strong support for the scale which assesses four dimensions of organizational job satisfaction. Principal component factor analysis of data from two independent samples of urban staff registered nurses (RNs) (n = 496; n = 532) confirmed four dimensions of pay, interaction, administration, and status. Cronbach's alpha for subscales ranged from .76 to .88. Pearson correlation coefficients for the interrelationships among subscales and an estimate of theta verified internal consistency. The Organizational Job Satisfaction Scale scores correlated significantly with a criterion measure of job enjoyment. Hypothesis testing of theoretically predictable relationships supported construct validity. Scores on the organizational job satisfaction subscales correlated significantly with automony, stress, and commitment. Item revisions and recommendations for future use of the instrument are discussed.     

Individual differences in intraperson variability in mood.

The experience sampling method and palm-top computers were used to obtain 75–200 randomly timed in situ assessments of 11 mood-related items from 54 Ss over 12–24 days. The variability in the distribution of an S's responses to each item was used as an estimate of intrasubject mood variability. Mood variability was stable across time and across situations. The intercorrelations among the individual item variabilities were also substantial; when the items were combined into a mood variability scale, the coefficient alpha was .84. The stability and internal consistency of mood variability could not be reasonably attributed to similarity in item valences, differences among the Ss in the situations they encountered, response biases, or response errors. It was concluded that mood variability is a stable personal characteristic, but additional analyses suggested that it may be independent from other kinds of intraperson variability. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Group therapist self-disclosure: Development and validation of a scale.

Developed the Group Therapist Orientation Scale consisting of 20 Likert-type items designed to measure attitudes toward therapist self-disclosure in group psychotherapy. With an original sample of 143 Ss the scale demonstrated reasonable internal consistency or item homogeneity. Validity data from 5 separate additional samples suggest that scores on the Group Therapist Orientation Scale related meaningfully to actual behavior in a group therapy context. Moreover, scores on the scale were associated with number of years experience as a group psychotherapist, involvement in encounter groups as both a leader and participant, and theoretical orientation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Combining activities of daily living with instrumental activities of daily living to measure functional disability

Measures of functional disability typically contain items that reflect limitations in performing activities of daily living (ADLs) or instrumental activities of daily living (IADLs). Combining IADL and ADL items together in the same scale would provide enhanced range and sensitivity of measurement. This article presents psychometric justification for a combined ADL/IADL scale. Data come from 2,977 disabled respondents in the 1989 National Long-Term Care Survey. Respondents indicated whether they received human help on 7 ADL items; they also indicated whether they were unable to perform each of 9 IADL items due to health reasons. Factor analyses using tetrachoric correlations demonstrated that 15 of the 16 items reflected one major dimension. Item response theory (IRT) methods were used to calibrate the items; a one-parameter IRT model fit the data. Item calibrations showed that ADL and IADL items were not hierarchically related. Analyses showed that a simple sum of item responses could be used to derive a measure of functional disability. Implications of using a 15-item ADL/IADL scale for eligibility determination and for comparing groups are discussed.     

Sex differences on the Rotter I–E scale.

Performed factor and item analyses of the matched scores of 200 male and 200 female undergraduates who completed Rotter's Internal–External Locus of Control Scale. Factors were similar to those derived in prior analyses. However, males and females responded to different items within the factors, and significant sex differences in responding were found on 8 of 23 keyed items on individual item analyses. Thus, total scores and some factors on the scale may represent different meanings for males and females. Implications for test construction and validation are discussed. (25 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Validation of a harmonized Spanish version of the IPSS: evidence of equivalence with the original American scale. International Prostate Symptom Score

OBJECTIVES: To validate the use in Spain of a linguistically harmonized Spanish version of the International Prostate Symptom Score (IPSS Sp), and to compare it with the original American scale (IPSS Am). METHODS: Validity and reliability were studied in 59 patients with benign prostatic hyperplasia (BPH) (age >50 years) and 68 control subjects without BPH (age 18 to 49 years). Construct validity was assessed by correlating IPSS Sp scores with the EuroQol-5D (EQ-5D), the Psychological General Well-Being Index (PGWBI), and item 8 (quality of life) of the IPSS. Discriminatory power was assessed by calculating the area under the receiver operating characteristic (ROC) curve. Reliability was evaluated using the test-retest method, and internal consistency was assessed using Cronbach's alpha. Sensitivity to change was expressed as the effect size in preintervention versus postintervention scores in 26 additional patients with BPH (age >50 years) who underwent transurethral resection of the prostate. RESULTS: Correlations of the IPSS Sp were -0.07 to 0.36 with EQ dimensions; -0.29 with the EQ visual analogue scale score; 0.14 to 0.41 with PGWBI dimensions; and 0.72 with item 8 of the IPSS. ROC area was 0.95 +/- 0.02 (standard error). Using a cutoff point of 7, sensitivity was 83% and specificity was 98%. Test-retest reliability was 0.92 and Cronbach's alpha was 0.79. Mean preoperative and postoperative IPSS Sp scores were 25.56 and 8.48, respectively (P < 0.001 ). Overall effect size was 2.52. These results are similar to those of the original American scale. CONCLUSIONS: This Spanish translation of the IPSS is valid, reliable, and sensitive to clinical change and has demonstrated equivalent psychometric properties to the original American instrument. Scores obtained with the two instruments can therefore be reliably compared and aggregated when statistically appropriate.     

Evaluation of the original Ontario Child Health Study scales

This article presents evaluative information on the use of the original Ontario Child Health Study scales to serve as original-level measures of conduct disorder, hyperactivity and emotional disorder among children in the general (non clinic) population. Problem checklist assessments were obtained from parents and teachers of children aged six to 16 and youth aged 12 to 16 drawn from a general population (n = 1,751); and a mental health clinic sample (n = 1,027) in the same industrialized, urban setting. The results showed that the original OCHS scales possess adequate psychometric properties to be used as original-level measures of disorder. Correlations between individual items and their hypothesized scales were very strong, indicating convergent validity, while correlations between the same items and other (non hypothesized) scales were lower, indicating discriminant validity. Item analyses indicated that individual scale items possess both convergent and discriminant validity. Although the scales were skewed to the positive end of the continuum, they demonstrated good internal consistency (all estimates > or = 0.74) and test-retest (all estimates > or = 0.65) reliability. Finally, three different validity analyses confirmed hypotheses about how the original OCHS scales should perform if they provide useful measures of disorder.