Table 2 Risk of chronic back pain and back-related disability at follow-up in 2017–2019 associated with change in sleep quality from 1995–1997 to 2006–2008.

Risk of back pain and change in sleep quality from 1995–1997 to 2006–2008	No. of persons	No. of cases	Age-adjusted, RR^a	Multi-adjusted RR (95% CI)^b
Chronic back pain
Remained good sleep	6636	1212	1.00	1.00 (reference)
Poor sleep to good sleep	433	101	1.35	1.30 (1.08–1.55)
Good sleep to poor sleep	1106	275	1.35	1.31 (1.16–1.48)
Remained poor sleep	426	129	1.71	1.65 (1.42–1.93)
Back-related disability
Remained good sleep	6636	486	1.00	1.00 (reference)
Poor sleep to good sleep	433	50	1.65	1.55 (1.17–2.06)
Good sleep to poor sleep	1106	138	1.66	1.59 (1.32–1.92)
Remained poor sleep	426	59	2.01	1.92 (1.48–2.49)

CI confidence interval, RR risk ratio.
^aAdjusted for age (continuous).
^bAdjusted for age (continuous), sex (women, men), education (primary school, high school, college ≤ 4 years, college > 4 years), body mass index (continuous), relative change in body weight (continuous), changes in physical activity (remained active, inactive to active, active to inactive, remained inactive), and smoking (never smoked, former smoker, current low-intensity smoker [< 10 cigarettes per day], medium-intensity smoker [10–19 cigarettes per day] and high-intensity smoker [20 or more cigarettes per day]).

Quick links

Search