Sedentary Behavior and Physical Function Decline in Older Women: Findings from the Women's Health Initiative

Table 2

Change in daily sitting time and total sedentary time between baseline and Year 3 of the OS, stratified by age.

Characteristic	All (𝑁, mean (SD))	Age Categories (years)
		50–59 (𝑁, mean (SD))	60–69 (𝑁, mean (SD))	70–79 (𝑁, mean (SD))
Sitting time (hours/day)
Baseline	61609, 7.47 (3.12)	21363, 8.07 (3.35)	27953, 7.23 (3.00)	12293, 6.97 (2.79)
Year 3	58111, 7.04 (2.93)	19888, 7.57 (3.20)	26541, 6.78 (2.77)	11682, 6.71 (2.67)
Change	58111, −0.43 (2.88)	19888, −0.50 (3.00)	26541, −0.45 (2.84)	11682, −0.27 (2.75)
𝑃 value for change^4	<.0001	<.0001	<.0001	<.0001
Total sedentary time (hours/day)
Baseline	61407, 8.63 (3.82)	21303, 9.14 (3.94)	27860, 8.42 (3.74)	12244, 8.21 (3.67)
Year 3	57565, 8.09 (3.44)	19697, 8.52 (3.62)	26308, 7.85 (3.33)	11560, 7.88 (3.30)
Change	57390, −0.54 (3.62)	19649, −0.61 (3.63)	26225, −0.58 (3.60)	11516, −0.33 (3.64)
𝑃 value for change^4	<.0001	<.0001	<.0001	<.0001

⁴𝑃 value was based on a 1-df 𝑡-test for the hypothesis of no significant change between baseline and year.