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Estimated value of 3DSS scores and multiple comparisons by ANCOVA (adjusted for age, gender, marital status, and company). Participants were classified into three groups based on SDS scores (under 39 = normal, 40–49 = slight depression, over 50 = moderate depression). There were significant differences (**p < 0.01; † p < 0.001, Bonferroni correction) for all comparisons of 3DSS scores
