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Table 1 Characteristics of all 520 women included in the study

From: Pregnancy related back pain, is it related to aerobic fitness? A longitudinal cohort study

Characteristic n Mean or proportion
Absolute V ˙ O 2 peak , est . , early pregnancy (L/min) 520 2.4 (0.5)
Physical activity ≥ once a week (%) 259/520 49.8
Previous back pain, irrespective of pregnancy (%) 238/520 45.8
Sick-leave due to back pain before pregnancy (%) 43/520 8.3
No previous pregnancy (%) 218/520 41.9
No previous delivery (%) 258/520 49.6
Age (yr) 520 29.0 (4.4)
Weight, gestational week 12 (kg) 520 68.1 (12.6)
Height (m) 520 1.67 (0.06)
University education (%) 520 43.9
Current smoker (%) 520 18.5
Back pain location throughout present pregnancy:   
   Cervico-thoracic (%) 69/459 15.0
   Lumbar (%) 67/459 14.6
   Lumbosacral (%) 274/471 58.2
   Sacral (%) 253/469 53.9
   Any back pain location (%) 373/479 77.9
Back pain of any location postpartum (%) 179/488 36.7
Back pain intensity (mm)   
   Gestational week 24 498 33.7 (31.5)
   Gestational week 30 497 38.0 (31.3)
   Gestational week 36 455 39.2 (32.0)
   Post partum week 22 488 18.3 (26.8)
  1. Back pain = cervico-thoracic, lumbar, lumbosacral or sacral pain location. V ˙ O 2 peak , est . = estimated peak oxygen uptake.