2.3. Data analysis
A statistical analysis package (IBM Corp. Released 2012. IBM SPSS Statistics for Windows, Version 21.0. Armonk, NY: IBM Corp.)was used for data analysis. Sociodemographic characteristics, work history, and health effects were described in terms of percentages, means and standard deviations. Factors affecting health were
analyzed using logistic regressionebackward elimination (premove ¼ 0.10) to determine the relationships between age, sex,smoking, drinking, duration of work (years) and seven types of abnormal symptoms: (1) repeated pain in the musculoskeletal
system, (2) symptoms throughout the body, (3) respiratory symptoms, (4) episodic finger symptoms, (5) face and skin symptoms, (6) peripheral circulation symptoms, (7)cardiovascular system symptoms.
2.3. Data analysisA statistical analysis package (IBM Corp. Released 2012. IBM SPSS Statistics for Windows, Version 21.0. Armonk, NY: IBM Corp.)was used for data analysis. Sociodemographic characteristics, work history, and health effects were described in terms of percentages, means and standard deviations. Factors affecting health wereanalyzed using logistic regressionebackward elimination (premove ¼ 0.10) to determine the relationships between age, sex,smoking, drinking, duration of work (years) and seven types of abnormal symptoms: (1) repeated pain in the musculoskeletalsystem, (2) symptoms throughout the body, (3) respiratory symptoms, (4) episodic finger symptoms, (5) face and skin symptoms, (6) peripheral circulation symptoms, (7)cardiovascular system symptoms.
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