Table 2 Association between log transformed cortisol (pg/mg) and sleep latency, sleep duration, sleep efficiency and physical activity before and after adjusting for sex, age and BMI z - scores

Sleep latency (min)

0.038

0.015

(−0.00, 0.035)

0.13

0.188

0.0084

(−0.011, 0.028)

0.40

Sleep duration (hours)

< 0.001

−0.0016

(−0.34, 0.34)

0.99

0.179

0.055

(−0.27, 0.38)

0.74

Sleep efficiency (%)^a

0.030

−3.1

(−7.7, 1.5)

0.18

0.179

−0.60

(−5.3, 4.1)

0.80

Physical activity (100 CPM)^b

0.033

0.014

(−0.008, 0.036)

0.22

0.178

0.013

(−0.009, 0.035)

0.22