Table 1.

Relative risk (RR) and 95% confidence intervals (CI) for newly diagnosed and exacerbated low back pain (LBP) among soldiers (18–21 years), by severity of disease and occupational category

Severity of LBP at recruitment	Occupational Categories	Incident cases (IR*) for 3 years	Incident cases (IR*) per year	RR (95% CI)	P
Category 1 (No history of LBP)	Administrative (n = 61,046)	2.09%	0.7%	1
	Car drivers (n = 3254)	2.09%	0.7%	1.0 (0.79–1.28)	0.957
	Truck drivers (n = 9689)	1.02%	0.34%	0.49 (0.40–0.60)	< 0.0001
Total	n = 73,989	1.95%	0.65%	–	–
Category 2 (Mild LBP)	Administrative (n = 4612)	2.67%	0.89%	1
	Car drivers (n = 333)	3.00%	1.00%	1.13 (0.60–2.12)	0.724
	Truck drivers (n = 743)	2.75%	0.92%	1.03 (0.5–1.81)	0.881
Total	n = 5418	2.69%	0.90%	–	–
Category 3 (LBP with mild clinical/radiographic findings)	Administrative (n = 1066)	7.41%	2.47%	1
	Car drivers (n = 60)	10.00%	3.33%	1.35 (0.61–2.97)	0.448
	Truck drivers (n = 66)	6.06%	2.02%	0.82 (0.31–2.16)	1.000
Total	n = 1192	7.47%	2.49%	–	–

Bold data already signifies a p < 0.05 i.e. significant finding