[Development of an indicator system for recognizing the sub-health status and study on the related reliability and validity].

Objective To establish a subjective indicator system for the evaluation of sub-health status and study on its reliability and validity. Methods Based on the basic features of general malice and losing ability of workforce, the indicator system for sub-health status evaluation was developed according to the chronic stress on human body' s main systems. The items were adjusted according to the experience from experts and the results of the pilot study. Indices as Chronbach' s a, IIC and ICC were used to evaluate the reliability of the questionnaire. Factor analysis and ANOVA were used to evaluate the construct validity and discriminative ability of the questionnaire. Results The formal sub-health survey questionnaire would include five domains and 25 questions in total. The whole questionnaire' s Chronbach's α coefficient was 0.92. Cronbach's α of the four domains, including cardiovascular, digestive tract, immunity and mental health were no less than 0.7 while IIC ranging from 0.51 to 0.72 and ICC ranging from 0.89 to 0.98. The five extracted common factors which contributed 62.35% to the total variation were basically consistent with the five dimensions. ANOVA showed significant differences among different groups (P<0.05). Conclusion The questionnaire appeared reliable and valid for measurement of sub-health status. Key words: Sub-health;  Reliability;  Validity