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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.