Table 2

Prevalence of spinal pain under different case-definitions among 46,726 Danish children from the Danish National Birth Cohort, 11–14 years of age, born between 1996 and 2003, stratified by child’s sex (chi-squared tests of heterogeneity between boys and girls were statistically significant for all case-definitions) (N = 46,726)

Case-definitions of spinal painOriginal data (unweighted data)Weighted dataa
Total
N (%)
Boys
N (%)
Girls
N (%)
Total (%)Boys (%)Girls (%)
Overall spinal painb
 No pain27,256 (58.3)13,667 (61.3)13,589 (55.6)57.360.154.7
 Moderate pain13,877 (29.7)6446 (28.9)7431 (30.4)30.029.430.4
 Severe pain5593 (12.0)2174 (9.8)3419 (14.0)12.810.414.9
Multiple spinal pain
 No pain41,133 (88.0)20,113 (90.2)21,020 (86.0)87.289.685.1
 One-sited pain4266 (9.1)1705 (7.7)2561 (10.5)9.78.011.2
 Multi-sited pain1327 (2.9)469 (2.1)858 (3.5)3.12.43.7
Spinal pain-related daily-life consequencesc
 Never36,541 (78.2)17,736 (79.6)18,805 (77.0)77.679.176.2
 1–2 times7561 (16.2)3471 (15.6)4090 (16.8)16.415.817.0
 More than 2 times2613 (5.6)1074 (4.8)1539 (6.3)6.05.06.9
 Missing11 (0.02)6 (0.03)5 (0.02)0.020.030.02
aInverse probability weights relative to all children born in Denmark from 1996 to 2003

bMain outcome of interest based on neck, middle back, and low back pain (see Fig. Fig.33)

cDefined as follows: “Never” if no experience of any of the daily-life consequences, “1–2 times” if they responded “once or twice” to only one of the daily-life consequences, and the remaining were categorized as “More than 2 times”