Table 3.

Associations Between LPA 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 LPA
Quartile 1 (low)	96/421	46.9	1.00		1.00
Quartile 2	65/422	30.2	0.87 (0.63–1.20)	.41	0.88 (0.64–1.22)	.45
Quartile 3	63/421	28.0	0.89 (0.64–1.23)	.48	0.90 (0.65–1.25)	.53
Quartile 4 (high)	50/423	22.0	0.76 (0.53–1.10)	.14	0.78 (0.54–1.13)	.18
p for trend				.17		.22
LPA in bouts of ≥10 min
Quartile 1 (low)	76/421	36.1	1.00		1.00		1.00
Quartile 2	67/421	30.6	1.02 (0.74–1.42)	.89	1.07 (0.77–1.49)	.70	1.14 (0.81–1.59)	.46
Quartile 3	58/422	26.3	0.83 (0.59–1.17)	.28	0.86 (0.61–1.22)	.40	0.96 (0.67–1.38)	.84
Quartile 4 (high)	73/423	32.8	1.06 (0.77–1.47)	.72	1.06 (0.77–1.48)	.71	1.17 (0.84–1.63)	.37
p for trend				.97		.99		.54
LPA in bouts of 1–9 min
Quartile 1 (low)	115/421	58.5	1.00		1.00		1.00
Quartile 2	66/422	30.3	0.66 (0.48–0.90)	.009	0.64 (0.46–0.87)	.01	0.63 (0.45–0.86)	.004
Quartile 3	53/421	23.3	0.68 (0.48–0.97)	.03	0.69 (0.49–0.99)	.04	0.68 (0.48–0.98)	.04
Quartile 4 (high)	40/423	17.4	0.63 (0.42–0.94)	.03	0.65 (0.43–0.99)	.046	0.64 (0.42–0.98)	.04
p for trend				.01		.03		.03

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 LPA variables (LPA in bouts of ≥10 or <10 min) plus factors in model 2.

The quartile cut points were: total LPA, 217.3, 276.4, and 336.0 min/d for men and 300.7, 364.0, and 428.4 min/d for women; LPA in bouts of ≥10 min, 56.6, 91.4, and 132.9 min/d for men and 112.3, 157.8, and 201.8 min/d for women; LPA in bouts of <10 min: 145.8, 175.7, and 209.0 min/d for men, 171.7, 202.0, and 233.4 min/d for women.

CI = confidence interval; HR = hazard ratio; LPA = light physical activity.