TABLE 2.

Odds ratio of low back pain associated with frequency of work from home stratified by work environment

	Age–sex adjusted				Multivariate a
	OR	95%CI		P	OR	95%CI		P
All participants (n = 12 774)
Frequency of telecommuting
Almost never	Reference				Reference
≤1 d/w	1.16	0.98	1.37	.082	1.18	0.99	1.41	.060
2–3 d/w	1.21	1.03	1.41	.021	1.27	1.08	1.50	.005
≥4 d/w	1.05	0.93	1.19	.437	1.15	1.01	1.32	.040
					0.109*			.003*
Participants with a good telecommuting environment b (n = 8474)
Frequency of telecommuting
Almost never	Reference				Reference
≤1 d/w	1.13	0.92	1.37	.238	1.15	0.94	1.41	.176
2–3 d/w	1.11	0.92	1.34	.282	1.17	0.96	1.43	.113
≥4 d/w	0.94	0.82	1.09	.431	1.03	0.88	1.21	.705
				.754*				.340*
Participants with a poor telecommuting environment b (n = 4300)
Frequency of telecommuting
Almost never	Reference				Reference
1 d/w	1.31	0.94	1.81	.111	1.25	0.89	1.76	.190
2–3 d/w	1.57	1.17	2.11	.003	1.58	1.16	2.16	.004
≥4 d/w	1.80	1.39	2.34	<.001	1.82	1.38	2.40	<.001
				<.001*				<.001*

We defined "good" as three or more questions answered "yes," and "poor" as two or fewer questions answered "yes."

^a The multivariate model adjusted for age, gender, body mass index, marital status, educational background, equivalent income, lifestyle habit (smoking, drinking, and physical activity), psychological status, and company size.

^b The telecommuting environment was assessed with the following questions: (1) "Do you have a place or room where you can concentrate on your work?" (2) "Is your desk well‐enough lit for you to work?" (3) "Do you have enough space on your desk to work?"; (4) "Is there enough space to stretch your legs?” (5) "Are the temperature and humidity in the room where you work were appropriate for working comfortably?"

^* P‐value of trend.