Study participants characteristics
Between July 27Flow chart of study profile.The demographic characteristics of enrolled participants were similar between different lots or workshops either in SS or PPS, with no statistically significant difference in age, gender, ethnicity, height, and weight (Demographic characteristics of study participants (SS and PPS).Chi-square test for sex and ethnic; analysis of variance (ANOVA) for age, height and weight; One-way ordered CMH chi-square test for categorical age.