Table 3.

 Incidence rates and incidence rate ratios for venous thromboembolism in users of drospirenone and levonorgestrel oral contraceptives

Exposure	Cases (n=186)	Person years	Incidence rate (95% CI) per 100 000 person years	Incidence rate ratio (95% CI)
Drospirenone/ethinylestradiol
Age <30	63	253 895	24.8 (19.1 to 31.7)	4.6 (2.6 to 8.2)
Age 30-39	42	107 701	39.0 (28.1 to 52.7)	2.1 (1.3 to 3.3)
Age 40-44	16	31 248	51.2 (29.3 to 83.2)	2.4 (1.2 to 4.8)
Levonorgestrel/ethinylestradiol 20 µg or 30 µg
Age <30	14	259 522	5.39 (2.94 to 9.05)	1.0
Age 30-39	35	187 017	18.7 (13.0 to 26.0)	1.0
Age 40-44	16	75 284	21.3 (12.1 to 34.5)	1.0

Crude incidence rate ratio=2.5 (95% CI 1.8 to 3.3).

Incidence rate ratio adjusted for age=2.8 (95% CI 2.1 to 3.8).