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Table 1 Description of four articles reporting on five studies on puberty and back pain

From: Is puberty a risk factor for back pain in the young? a systematic critical literature review

Reference number [33] [33] [35] [34] [32]
1st author Jansens Jansens Wedderkopp LeResche Hulsegge
Year 2011 2011 2005 2005 2011
Country Netherland USA Denmark USA Netherland
Design Longitudinal Longitudinal Cross-sectional Cross-sectional Cross-sectional
Sample size BL: 2935 BL: 4079 419 3101 2698
FU: 1816 FU: 1817
Response rate BL:76% BL: 49% 51% 49% 66%
1st FU: 73% FU: 45%
2nd FU: 62%  
Age BL: 11.1 BL: 11 8-10 and 14-16 11-17 11
FU: 15.1 FU: 14
Sex distribution (% of girls) 51 51 100 50 49
Description of puberty 4 stages 4 stages 5 stages 4 stages 4 stages
Data collection for puberty Questionnaire PDS Telephone itw PDS Physical examination Tanner stages Telephone itw PDS Questionnaire PDS
Description of back pain BP = frequency BP = frequency BP = areas (LBP/MBP/NP) BP = duration (>one day or more) BP = duration (>1-month)
Data collection for back pain Questionnaire Telephone itw Semi-structured itw Telephone itw Questionnaire
Recall period for back 3-months 3-months 1-month 3-months 12-months
Other extrinsic factors than age and sex Pubertal status at BL Pubertal status at BL Overweight Smoke Previous pain Depression Not in the analysis for back pain
BP at BL BP at BL
Dose-response analysis possible Prevalence estimate AND frequency of symptoms in relation to puberty stages Prevalence estimate AND frequency of symptoms in relation to puberty stages Prevalence estimate in relation to puberty stages Prevalence estimate in relation to puberty stages Prevalence estimate in relation to puberty stages
  1. BL = baseline, FU = follow up, Itw = interview, PDS = pubertal development scales, BP = back pain.