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Table 1 Comparisons between 1) those who dropped out before week 12, 2) participants who did not answer every week but fulfilled the criteria for being in the study population, and 3) those responding every week.

From: The Nordic back pain subpopulation program: course patterns established through weekly follow-ups in patients treated for low back pain

  1) Dropped out before week 12
n = 32
The study population
2) + 3)
n = 78
2) Study population
who did not answer all weeks
n = 34
3) Study population
responding every week
n = 44
Gender (%):     
Male 69 50 35 61
Female 31 50 65 39
Age     
(mean [SD]) 42.3 [11.5] 42.5 [9.9] 43.0 [9.4] 42.1 [10.3]
Duration of episode (%):     
1 - 7 days 22 45 35 52
8 - 12 weeks 44 33 38 30
> 12 weeks 34 19 21 18
missing 0 3 6 0
Localisation (%):     
LBP 44 55 47 61
LBP + leg pain 53 41 44 39
missing 3 4 9 0
No. of LBP days the 1st week n = 22 n = 74 n = 30 n = 44
(mean [SD]) 4.7 [2.7] 4.9 [2.2] 4.6 [2.4] 5.1 [2.0]
Present pain intensity at the 1st follow-up (%): n = 24 n = 75 n = 31 n = 44
no pain 29 23 29 18
some 58 61 55 66
severe 13 16 16 16