Musculoskeletal pain in other body sites is associated with new-onset low back pain: a longitudinal study among survivors of the great East Japan earthquake

Table 3 Stratified analysis for each age group

	Number of musculoskeletal pain sites except LBP
	total	0	1	≥ 2	P for trend	P-interaction
	1782	1343	283	156
Sex
Male (n = 826)
New-onset LBP/participants	117/826 (14.2%)	75/678 (11.1%)	26/97 (26.8%)	16/51 (31.4%)
Adjusted OR (95% CI)		1	3.16 (1.68–5.95)	4.60 (2.06–10.30)	< 0.001
Female (n = 956)						0.12
New-onset LBP/participants	134/956 (14.0%)	80/665 (12.0%)	27/186 (14.5%)	27/105 (25.7%)
Adjusted OR (95% CI)		1	1.24 (0.71–2.14)	2.54 (1.38–4.68)	0.011

Adjusted for age, body mass index, living area, smoking habits, drinking habits, complications, working status, walking time, living status, subjective economic condition, Kessler Psychological Distress Scale, Athens Insomnia Scale, and Lubben Social Network Scale. LBP: low back pain, OR: Odds ratio, CI: Confidence interval

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