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Table 1 Descriptive statistics and correlations among the key variables (n = 3250)

From: The association between sleep quality and psychological distress among older Chinese adults: a moderated mediation model

Variables M ± SD 1 2 3 4 5
1 PSQI score 5.082 ± 3.436 1     
2 Barthel Index score 91.699 ± 18.350 −0.263** 1    
3 Physical activity level 2.149 ± 0.756 −0.100** 0.364** 1   
4 PSSS 66.155 ± 13.687 −0.180** 0.237** 0.228** 1  
5 DASS-21 score 19.142 ± 20.566 0.444 ** −0.473** −0.217** − 0.320** 1
  1. Note: **p < 0.01, PSSS Perceived Social Scale score