Table 2.

Unadjusted and adjusted hazard ratios for risk of incident hypertension

	Bivariate Model		Adjusted Model 1a		Adjusted Model 2 a
	HR	95% CI	HR	95% CI	HR	95% CI
Age	1.05	1.04–1.07	1.04	1.03–1.06	1.04	1.02–1.06
Body mass index (<25=reference)
25–29.9	2.81	1.71–4.64	2.79	1.68–4.61	2.79	1.69–4.63
>30	4.08	2.49–6.71	4.36	2.63–7.22	4.34	2.62–7.19
Unknown	1.72	0.58–5.10	1.11	0.35–3.47	1.04	0.33–3.27
Smoking Status (Never=reference)
Ever	1.22	0.92–1.62	1.25	0.93–1.67	1.20	0.89–1.61
Unknown	1.46	1.01–2.11	1.53	1.03–2.29	1.48	0.99–2.21
Noise exposure (continuous)	1.00	0.98–1.03	–		–
Noise exposure (< 82dBA=reference)
82–84.99 dBA	1.02	0.76–1.38	1.01	0.70–1.45	–
85–87.99 dBA	0.97	0.66–1.43	1.01	0.63–1.61	–
≥ 88 dBA	0.95	0.63–1.44	0.98	0.58–1.65	–
Baseline average hearing threshold at 3, 4, 6 kHz	1.02	1.01–1.02	1.01	1.00–1.02	1.01	1.00–1.01
Average annual loss in hearing threshold at 3, 4, 6 kHz	1.21	1.07–1.37	1.09	0.94–1.26	–
Average annual loss in hearing threshold at 3, 4, 6 kHz categorized (Quintile 1=reference)
Quintile 2	0.81	0.51–1.28	–		0.75	0.47–1.20
Quintile 3	0.92	0.59–1.43	–		0.91	0.58–1.44
Quintile 4	0.83	0.52–1.31	–		0.68	0.43–1.10
Quintile 5	1.82	1.20–2.77	–		1.35	0.87–2.10
Annual wages, per 10,000 USD	0.88	0.79–0.99	0.83	0.73–0.93	0.83	0.73–0.93
History of noise in ears	0.89	0.68–1.17	–		–
History of noisy hobbies	1.11	0.86–1.43	–		–
History of shooting or hunting	0.94	0.73–1.22	–		–
Currently has another noisy job	0.93	0.71–1.23	–		–
Previously had a noisy job	1.17	0.89–1.52	–		–
Worked in smelter	0.93	0.71–1.22	–		–

^aRandom effects included for job category and plant location