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Table 2

Quality assessment of four articles reporting on five studies on puberty and back pain

Jansens [ 33 ] (Netherlands) Jansens [ 33 ] (USA) Wedderkopp [ 35 ] LeResche [ 34 ] Hulsegge [ 32 ]
1. Study sample- Was the sampling likely to be suitable to obtain a group representative of the corresponding general population?Yes (Probably)Yes (Probably)Yes (Probably)Yes (Probably)Yes (Probably)
- If participation at BL or at FU < 80%, was response bias investigated?YesYesYesYesNo
- Inclusion criteria, were age groups appropriate to study the whole period of puberty?YesYesYesYesNot really
2. Data collec-tion- Data for BP and puberty were collected independently by 2 different persons or by at least 1 questionnaire?YesNoYesNoYes
3. Puberty- Clearly defined?YesYesYesYesYes
- Description of how puberty stage was determined?YesYesYesYesYes
- Reference provided for validity of test?NoNoNoYesYes
- Reference provided for reliability of test?YesYesNoNoNo
4. Back pain- Clearly defined?YesYesYesYesYes
- Description of how BP was assessed?YesYesYesYesYes
- Recall period (<= 1 month)?NoNoYesNoNo
- Was BP at BL taken into account?YesYesNANANA
5. Control for age and sex- Was the association puberty- BP controlled for age?YesYesStratified analysisYesYes
- for sex?YesYesNAStratified analysisYes
6. Stat. analysis- Was dose–response prevalence estimated in relation to puberty stages investigated?YesYesYesYesNo
- Was dose–response of frequency or severity in relation to puberty stages investigated?NoNoNANANA
- Was dose–response tested for trend?YesYesYesYesYes
Score (0–17)%14/1713/1712/1412/1510/15

(listed by the quality score).

BL = baseline, FU = follow up, BP = back pain, NA = not applicable.

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