Developing the quality of life in pregnancy scale (PREG-QOL).

AIM: This study aims to develop the Quality of Life in Pregnancy Scale (PREG-QOL) as a new instrument to evaluate the quality of life during pregnancy and test its psychometric properties.

DESIGN

An instrument development study and psychometric testing of the content and construct validity, factor structure and reliability.

METHODS

The study was conducted in three stages: (1) creating an item pool, (2) preliminary evaluation of items, and (3) refining the scale and evaluating psychometric properties. Instrument development guidelines were used to evaluate content validity, construct validity, internal consistency and stability of the instrument over time. Data to evaluate psychometric properties of the PREG-QOL were collected between April and August 2021.

RESULTS

Items were developed using in-depth interviews with pregnant women and extensive literature review. Scale-content validity index was 0.98. Exploratory factor analysis revealed a 26-item instrument with 6 factors, which explained % 56.2 of variance. Confirmatory factor analysis (CFA) showed that factors 3 and 5 should be combined into the factor of physical domain since they included items about the same theme. Fit indices obtained by CFA were at sufficient levels. Parallel test method was employed to evaluate the correlation of the PREG-QOL with the SF-36. The findings indicated that the PREG-QOL had high internal inconsistency and stability over time.

CONCLUSION

The PREG-QOL is a valid and reliable instrument in terms of its psychometric characteristics. The 26-item instrument was composed of the five factors of perception of general satisfaction, emotional domain, physical domain, health support systems and social domain.

IMPACT: Displaying good psychometric properties, the PREG-QOL may be used to evaluate multiple dimensions of the quality of life during pregnancy.