Table 5. The modification of parental education on the association between the variable pain categories and school grades.
| Difference in school grades between those with symptoms and the symptom free Estimated difference (95% CI) |
||||||
|---|---|---|---|---|---|---|
| Girls | Boys | |||||
| Only headache | Only abdominal pain | headache and abdominal pain | Only headache | Only abdominal pain | headache and abdominal pain | |
| 10% percentile | ||||||
| Low parental education | -15 (-15.5 ; -14.5) | -53 (-54.2 ; 52.6) | -85 (-85.4 ; 84.2) | -35 (-36.1 ; -33.7) | -5 (-7.2 ; -3.7) | -100 (-101.9 ; 97.9) |
| High parental education | -5 (-5.6 ; -4.7) | -15 (-15.9 ; -14.6) | -26 (-26.6 ; -25.3) | -6 (—6.7 ; -4.5) | -5 (-6.0 ; -3.0) | -73 (-74.6 ; -70.8) |
| 50% percentile | ||||||
| Low parental education | -12 (-12.6 ; -11.9) | -21 (-21.2 ; -20.2) | -33 (-33.8 ; -32.9) | -15 (-15.3 ; -14.8) | -5 (-5.1 ; -4.4) | -20 (-20.9 ; -20.0) |
| High parental education | -9.6 (-9.9 ; -9.4) | -10 (-10.4 ; 9.7) | -25.6 (-25.9 ; -25.3) | -14.5 (-14.7 ; -14.3) | -9 (-9.5 ; -8.9) | -30 (-30.7 ; -29.9) |
| 90% percentile | ||||||
| Low parental education | -10.6 (-10.8 ; -10.4) | -15 (-15.6 ; 15.1) | -23 (-23.1 ; -22.6) | -24 (-23.8 ; -23.3) | -2 (-2.5 ; 1.5) | -29 (-29.4 ; -28.3) |
| High parental education | -5.3 (-5.4 ; -5.2) | -5.2 (-5.3 ; -5.1) | -10.5 (-10.6 ; -10.4) | -10.6 (-10.7 ; 10.6) | -9.8 (-9.9 ; 9.7) | -20.3 (-20.4 ; 20.2) |
The association is investigated with a quantile regression, using data from both cohorts, 2000 and 2008, in 10% percentile, 50% percentile and in 90% percentile of school grades. NGirls = 9889, NBoys = 9685. The models are adjusted for year (2000 and 2008) and foreign origin.