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Table 1 Background information on the study groups and the reference group (wrist fractures) for the survival analysis

From: Birth rate after major trauma in fertile-aged women: a nationwide population-based cohort study in Finland

  TBI group Spine fracture group Pelvic fracture group Hip or thigh fracture group Wrist fracture group
Total number of women included* 22,780 3627 1820 1769 4957
Age at the start of follow-up
 15–24 years 10 273 (45.1%) 1476 (40.7%) 852 (46.8%) 707 (40.0%) 2004 (40.4%)
 25–34 years 5965 (26.2%) 1018 (28.1%) 481 (26.4%) 437 (24.7%) 1430 (28.8%)
 35–44 years 6542 (28.7%) 1133 (31.2%) 487 (26.8%) 625 (35.3%) 1523 (30.7%)
Number of women giving birth during the 5-year follow-up (%) 4324 (19.0%) 652 (18.0%) 301 (16.5%) 220 (12.4%) 925 (18.7%)
Age at the time of trauma (mean; SD) 27.6 (9.2) 28.5 (9.1) 27.4 (9.2) 28.4 (9.1) 28.4 (9.1)
Age at the time of delivery (mean; SD) 28.0 (5.6) 28.5 (5.5) 27.9 (5.4) 28.7 (5.4) 28.7 (5.4)
Follow-up period in weeks (mean; SD) 237.6 (55.6) 237.8 (56.3) 240.9 (52.3) 246.4 (44.6) 237.9 (55.6)
  1. *Because a 5-year follow-up period was required, only women with trauma occurring before 2014 and aged under 45 years at the time of trauma were included for Cox survival analysis