Table 2.

Associations Between MVPA Measures and Functional Disability

	No. of Events/ Subjects	Incidence Rate per 1,000 Person-Years	Model 1		Model 2		Model 3
			HR (95% CI)	p	HR (95% CI)	p	HR (95% CI)	p
Total MVPA
Quartile 1 (low)	137/420	72.7	1.00		1.00
Quartile 2	71/420	32.9	0.70 (0.52–0.94)	.02	0.70 (0.52–0.95)	.02
Quartile 3	39/424	16.7	0.43 (0.29–0.62)	<.0001	0.44 (0.30–0.65)	<.0001
Quartile 4 (high)	27/423	11.5	0.37 (0.24–0.57)	<.0001	0.39 (0.25–0.62)	<.0001
p for trend				<.0001		<.0001
MVPA in bouts of ≥10 min
Quartile 1 (low)	122/416	64.3	1.00		1.00		1.00
Quartile 2	65/425	29.0	0.62 (0.46–0.85)	.003	0.58 (0.42–0.79)	.0007	0.68 (0.49–0.95)	.02
Quartile 3	55/423	24.2	0.65 (0.47–0.91)	.01	0.66 (0.46–0.93)	.02	0.87 (0.60–1.25)	.44
Quartile 4 (high)	32/423	13.8	0.44 (0.29–0.66)	<.0001	0.45 (0.29–0.69)	.0002	0.59 (0.38–0.92)	.02
p for trend				<.0001		.0003		.047
MVPA in bouts of 1–9 min
Quartile 1 (low)	132/420	69.4	1.00		1.00		1.00
Quartile 2	73/421	33.5	0.84 (0.62–1.14)	.26	0.85 (0.63–1.15)	.30	0.87 (0.64–1.18)	.38
Quartile 3	40/422	17.5	0.51 (0.35–0.74)	.0004	0.52 (0.36–0.76)	.0007	0.54 (0.37–0.79)	.002
Quartile 4 (high)	29/424	12.3	0.43 (0.28–0.66)	.0001	0.45 (0.29–0.70)	.0004	0.50 (0.32–0.78)	.002
p for trend				<.0001		<.0001		.0001

Note: Model 1 adjusted for age, sex, and wear time.

Model 2 adjusted for education, body mass index, living alone, cognitive impairment, multimorbidity, low extremity limitation, smoking, drinking plus factors in model 1.

Model 3 adjusted for other MVPA variables (MVPA in bouts of ≥10 or <10 min) plus factors in model 2.

The quartile cut points were: total MVPA, 16.9, 34.8, and 57.8 min/d for men and 20.6, 40.0, and 64.1 min/d for women; MVPA in bouts of ≥10 min, 1.6, 9.0, 27.9 min/d for men and 1.4, 8.6, and 21.9 min/d for women; MVPA in bouts of <10 min, 10.0, 19.0, and 30.8 min/d for men and 15.5, 27.8, and 42.6 min/d for women.

CI = confidence interval; HR = hazard ratio; MVPA = moderate-to-vigorous physical activity; PY = person-year.