An Open-label, Multi-center Study Evaluating the Validity, Reliability, and Responsiveness of a New Female-specific Angina Questionnaire in Women With Chronic Angina Treated With Ranolazine Extended-release Tablets (CVT 3041)

Validity of the WISQ was assessed by regression analysis. Results of this analysis are reported as the estimated coefficient of determination (R^2) of the WISQ Total Score at 4 weeks regressed on 4-week angina frequency, 4-week NTG use, and DASI score at 4 weeks. For mean (SEM) Baseline and Week 4 values for angina frequency and NTG use, please refer to Secondary Outcome Measures 7 and 8. For mean (SEM) Baseline and Week 4 DASI values, please refer to Secondary Outcome Measure 9.

Reliability of the WISQ was assessed by estimating Cronbach's alpha (standardized); values of 0.7 or higher were to be considered adequate. (Standardized Cronbach's alpha is a coefficient of reliability or consistency, and is a function of the average inter-item correlation.) Cronbach's alpha was calculated for the WISQ instrument overall and for the Angina Frequency/Severity and Angina Stability subscales. Missing item responses were not imputed.

Responsiveness of the WISQ was assessed as the estimated coefficient of determination (R^2) of the change from baseline WISQ Total Score at 4 weeks regressed on change from baseline angina frequency and change from baseline NTG use. For mean (SEM) Baseline and Week 4 values for angina frequency and NTG use, please refer to Secondary Outcome Measures 7 and 8.

Changes from BL in angina frequency items following ranolazine treatment were measured. Analysis: multiple linear regression; response variable: ΔWISQ - ΔSAQ; independent variables: age and BL WISQ and SAQ scores. WISQ items: 15 points (higher=more severe state); SAQ items: 12 points (lower=more severe state). WISQ scores were recalibrated by multiplying by .75. Noninferiority was to be considered demonstrated if the lower limit of a 2-sided 95% CI for WISQ mean - SAQ mean was above the prespecified margin (WISQ vs SAQ difference of -2).

Changes from BL in stress, excitement, temperature, satiety, anger, and other limitation items following ranolazine treatment were measured. Analysis: multiple linear regression; response variable: ΔWISQ - ΔSAQ; independent variables: age and BL WISQ and SAQ scores. WISQ items: 27 points (higher=more severe state); SAQ items: 45 points (lower=more severe state). WISQ scores were recalibrated by multiplying by 15/27. Noninferiority was to be considered demonstrated if the lower limit of a 2-sided 95% CI for WISQ mean - SAQ mean was above the prespecified margin (WISQ vs SAQ difference of -2).

Changes from BL in stress, excitement, temperature, satiety, anger, and other limitation items following ranolazine treatment were measured. Analysis: multiple linear regression; response variable: ΔWISQ - ΔSAQ; independent variables: age and BL WISQ and SAQ scores. WISQ items: 27 points (higher=more severe state); SAQ items: 45 points (lower=more severe state). WISQ scores were recalibrated by multiplying by 15/27. Noninferiority was to be considered demonstrated if the lower limit of a 2-sided 95% CI for WISQ mean - SAQ mean was above the prespecified margin (WISQ vs SAQ difference of -2).

Angina episodes were recorded by subjects in their diaries. Weekly frequency of angina episodes was calculated for the two-week baseline period and the last two weeks of the study.

Nitroglycerin use was recorded by subjects in their diaries. Weekly frequency of NTG use was calculated for the two-week baseline period and the last two weeks of the study.

The DASI was analyzed as mean values at baseline and Week 4. The DASI is a self-administered questionnaire that measures a patient's functional capacity. It can be used to get a rough estimate of a patient's peak oxygen uptake. The maximum score for the DASI is 58.2 (better functional ability/capacity) and the minimum score is 0 (worse functional ability/capacity).

The DASI is a self-administered questionnaire that measures a patient's functional capacity. It can be used to get a rough estimate of a patient's peak oxygen uptake. The maximum score for the DASI is 58.2 (better functional ability/capacity) and the minimum score is 0 (worse functional ability/capacity). The planned analysis was the amount of variation in WISQ and SAQ score changes from baseline explained by changes in angina frequency, NTG use, and DASI score assessed by multiple linear regression analysis.