Table 4.

Relative risk (RR) of recovery from spinal pain and activity limiting spinal pain in adult offspring associated with parental spinal pain; analysis stratified by BMI

Variables	Normal weight			Overweight/obese
	No of persons	No of cases	Adjusted RR* (95% CI)	No of persons	No of cases	Adjusted RR* (95% CI)
Offspring spinal pain
Parental spinal pain
None	168	68	1.00 (ref.)	177	69	1.00 (ref.)
Mother or father	316	111	0.88 (0.70 to 1.12)	380	133	0.89 (0.70 to 1.12)
Both parents	242	82	0.86 (0.66 to 1.11)	242	76	0.79 (0.61 to 1.03)
Offspring activity limiting spinal pain
Parental spinal pain
None	86	34	1.00 (ref.)	130	50	1.00 (ref.)
Mother or father	151	42	0.72 (0.49 to 1.04)	301	98	0.72 (0.51 to 0.99)
Both parents	129	41	0.84 (0.57 to 1.24)	188	52	0.57 (0.39 to 0.84)

*Adjusted for age, sex, leisure physical activity, smoking, education and depression.

BMI, body mass index.