Instrument for Data collection:
The questionnaires used for this study had three parts: part A, B and C. Part A consist of the socio-demographic variables of the respondents and the workplace factors while part B was World Health Organization Quality of Life questionnaire (WHOQOL BREF) with 26 items and Part C was the Standard Nordic Musculoskeletal questionnaire used to assess the rate of work related musculoskeletal disorders. The Nordic Musculoskeletal question was scored 1 for yes and 0 for no. It is used to assess the disorders of the musculoskeletal system within 12 months duration. It has questions on the nine parts of the body that are commonly affected by WRMSDs. This questionnaire has been tested for reliability by the developers through test retest method with a good Cronbach’s alpha value of 0.78, 0.91 and 1.00 across the times. The WHOQOL questionnaire was developed by WHO in 1995 to assess the effect of workers’ work on their quality of life and impacts of disease on the workers life. It was developed based on the perception of the individual about their quality of life in different domains. It was designed for transcultural uses and in clinical and research studies.
The quality of life questionnaire has five likert scale items that were scored using “1”= very dissatisfied, “2”= dissatisfied, “3”=neither dissatisfied nor satisfied, “4”=satisfied, “5”= very satisfied. To further determine the predictors of quality of life among the quarry workers using multiple logistic regression, the researcher had categorized the quality of life from four domains into two domains (Dissatisfied/poor Qol and satisfied/good Qol). This categorization was made based on the workers responses to one of the questions, which seeks to determine the overall level of the workers’ quality of life. The reliability of WHOQOL questionnaire has been established with a Cronbach alpha value of 0.7 and 0.8 across studies [27, 28].