Table 3. The association between TV time, internet use and muscle strength in women (N = 3383).

Sedentary exposure	N	Age adjustedB* (95% CI)	MultivariateB* (95% CI)	Age adjustedB* (95% CI)	MultivariateB* (95% CI)
TV time		Hand grip (kg)		Chair stand time (secs)
<2 hrs/d	306	Reference	Reference	Reference	Reference
2<4 hrs/d	1127	−0.47 (−1.19, 0.25)	−0.41 (−1.10, 0.29)	−0.04 (−0.46, 0.54)	−0.14 (−0.64, 0.34)
4<6 hrs/d	952	−1.07 (−1.81, −0.34)	−0.65 (−1.37, 0.07)	0.53 (0.02, 1.04)	−0.04 (−0.54, 0.45)
≥6 hrs/d	998	−1.54 (−2.26, −0.81)	−0.75 (−1.48, −0.03)	0.71 (0.20, 1.22)	−0.04 (−0.54, 0.47)
p-trend		<0.001	0.173	<0.001	0.90
Internet usage
No	1541	Reference	Reference	Reference	Reference
Yes	1842	1.55 (1.12, 1.98)	0.76 (0.32, 1.20)	−0.79 (−1.10, −0.49)	−0.17 (−0.48, 0.13)
p-trend		<0.001	0.001	<0.001	0.268

Multivariate model includes adjustments for age, smoking, physical activity, alcohol, social class, disability, chronic illness, body mass index, CES-D score, and mutually for TV time or internet use.

^*General linear model coefficients; coefficients indicate mean differences (in muscle strength markers) between each screen time group and the reference category.