Table 4 Influence of Individual metal exposure and metal mixture on global PSQI score.

From: Associations between essential trace elements and sleep quality in Iranian adults based on the Pittsburgh Sleep Quality Index

Metals

Beta (SE)

95% CI

P value

Single metal effects in linear regression models

 Ca (mcg/dL)

0.04 (0.17)

(− 0.29, 0.38)

0.78

 Co (µ g/l)

− 0.78 (0.43)

(− 1.63, 0.07)

0.04*

 Cu (mcg/dL)

0.02 (0.01)

(− 0.001, 0.04)

0.20

 Fe (mcg/dL)

− 0.02 (0.01)

(− 0.03, 0.00)

0.03*

 Mg (mg/dL)

1.09 (1.99)

(− 2.88, 5.06)

0.58

 Mn (µ g/l)

0.09 (0.18)

(− 0.25, 0.44)

0.59

 Se (mg/dL)

− 0.10 (0.16)

(− 0.41, 0.22)

0.54

 Zn (mg/dL)

− 0.03(0.03)

(− 0.09, 0.03)

0.36

Overall effects of the metal mixture

 Quantile g-computation model

− 0.54 (1.24)

(− 2.97, 1.89)

0.66

  1. *indicates P value < 0.05.