Table 3.

IRRs of rhegmatogenous retinal detachment. Estimates from Poisson regression models with random intercept on occupational groups (NYK-83, three-digit level). Swedish men born in 1949–1951 and conscripted for compulsory military service in 1969–1970

		Crude estimates			Estimates adjusted by myopia degree*			Estimates adjusted by myopia degree and socioeconomic factors†
Lifting Index	Cases	IRR	(95% CI)	p trend	IRR	(95% CI)	p trend	IRR	(95% CI)	p trend
<2	161	1.00	(Ref.)		1.00	(Ref.)		1.00	(Ref.)
2/3	23	0.73	(0.47–1.13)		0.89	(0.57–1.38)		1.01	(0.64–1.61)
4/7	25	1.04	(0.67–1.59)		1.31	(0.86–2.01)		1.51	(0.97–2.37)
≥8	8	1.54	(0.74–3.20)	0.776	2.09	(1.02–4.27)	0.082	2.38	(1.15–4.93)	0.014

IRR, incidence rate ratio; Ref., reference category.

^*Estimates adjusted by myopia degree.

^†Estimates adjusted by myopia degree, education level and income.