Table 2.

Birth rate (per 10,000 person-years) with 95% CI in patients with total hip replacement (THR) and reference individuals without THR according to age at the start of follow-up, number of previous live-born children before THR, marital status, diabetes mellitus diagnosis, and rheumatoid arthritis diagnosis in Finland, 1985–2006

	Men		Women
	Patient	Reference	Patient	Reference
	Rate (95% CI)	Rate (95% CI)	Rate (95% CI)	Rate (95% CI)
Age in years at the start of follow-up
15–19	216 (97–480)	377 (262–542)	216 (130–358)	570 (463–700)
20–34	300 (252–357)	515 (474–559)	165 (140–195)	400 (374–429)
35–39	114 (89–145)	149 (132–169)	25 (16–38)	63 (54–74)
40–45	27 (20–38)	47 (41–54)	2.4 (0.9–6.4)	5.4 (3.7–7.8)
46–50 for men	13 (8.7–21)	12 (8.9–15)	N/A	N/A
Number of previous live-born children
0	82 (67–100)	145 (132–159)	86 (70–104)	247 (227–268)
≥ 1	60 (51–70)	77 (72–83)	35 (28–44)	71 (65–77)
Marital status
Never married	36 (25–50)	78 (67–90)	39 (28–55)	116 (101–134)
Ever married	76 (67–87)	99 (93–106)	57 (48–66)	109 (102–116)
Diabetes mellitus
Yes	52 (19–138)	38 (17–84)	46 (12–185)	70 (26–186)
No	67 (59–76)	95 (90–101)	52 (45–61)	110 (108–117)
Rheumatoid arthritis
Yes	64 (47–86)	40 (15–108)	53 (42–67.5)	73 (33–163)
No	67 (59–77)	95 (90–101)	52 (43–62)	110 (104–117)
Total	67 (59–75)	95 (89–100)	52 (45–60)	110 (104–116)