Incidence and Risk Factors of Low Back Pain in Marathon Runners

Table 1

Occupational physical activity characteristics of different age groups for runners.

Age groups (%)	Conditions	Sedentary groups	Indoor activity groups	Outdoor activity groups	Student groups	Other groups	Total	Incidence (LBP) (%)
		Number	Number	Number	Number	Number	Number
18–20	Non-LBP	6	3	5	8	0	22	0.125
	LBP	0	0	0	1	0	1
	Total	6	3	5	9	0	23
21–30	Non-LBP	163	25	55	29	15	287	1.75
	LBP	5	1	6	1	1	14
	Total	168	26	61	30	16	301
31–40	Non-LBP	204	15	59	0	21	299	2.25
	LBP	10	3	4	0	1	18
	Total	214	18	63	0	22	317
41–50	Non-LBP	69	7	22	1	18	117	0.25
	LBP	1	0	1	0	0	2
	Total	70	7	23	1	18	119
51–60	Non-LBP	22	1	4	0	5	32	0.125
	LBP	1	0	0	0	0	1
	Total	23	1	4	0	5	33
≥61	Non-LBP	0	2	3	0	2	7	0
	LBP	0	0	0	0	0	0
	Total	0	2	3	0	2	7
Total (LBP)		17	4	11	2	2	36	4.50

Non-LBP: non-low back pain; LBP: low back pain.