Abstract: ObjectiveTo assess the reliability and validity of the Sub-health Measurement Scale Version 1.0 (SHMS V1.0) for measuring the sub-health status of new-generation migrant workers in the Pearl River Delta (PRD). MethodsA regional stratified sampling method was used to select the new-generation migrant workers in 7 prefecture-level cities in PRD. The survey contents included general information, lifestyle and experience events, SHMS V1.0, and the short form 36 health survey questionnaire (SF-36). Methods of sub reliability half reliability and internal consistency for reliability rating scale, construct validity, criterion validity, and responsiveness scale for validity assessment scale were used. ResultsA total of 1 500 questionnaires were distributed and 1 238 valid ones were recovered, with an effective response rate of 82.53%. Of the 1 238 responders, 530 (42.8%) were male, 807 (65.2%) were married, and 562 (45.4%) had educational level at junior middle school or below. The Cronbach's α coefficient of SHMS V1. 0 was 0.923 and the split-half reliability was 0.855. The scale of correlation coefficient of each dimension and the subscale was between 0.520 and 0.890, indicating the correlation was larger and the correlation coefficient of other subscale was smaller. Extracted 7 principal components by varimax rotation method, the cumulative contribution rate was 63.576%. Each entry had higher load value on one factor (between 0.588 and 0.886), but had lower load value on the other 6 factors. The correlation coefficient between total score of SHMS V1. 0 and total score of SF-36 was 0.750 (P＜0.01). The ceiling/floor effect revealed high sensitive that top score percentage of physiological, psychological, and social subscales in total scale was between 0.08 and 3.23 and lowest score proportion of each subscale in the total scale ranged from 0.08 to 0.72. The proportion of highest and lowest scores was small, suggesting that the responsiveness of the scale was sensitive. ConclusionSHMS V1.0 is a reliable, valid, and sensitive measurement scale for measuring the sub-health of the new-generation migrant workers in PRD.