Table 2*

Determinants of good marks (adjacent-category model, OR and 95% CI for an increase in median grades by 1)

BivariateFull modelParsimonious
Sociodemographic variables
Being a girl1.29 (1.03 to 1.55)1.32 (1.00 to 1.64)1.33 (1.01 to 1.65)
Age at survey (vs 13–14)
 ≤121.74 (1.31 to 2.17)1.70 (1.18 to 2.21)1.68 (1.17 to 2.18)
 ≥150.74 (0.56 to 0.93)0.75 (0.53 to 0.97)0.78 (0.56 to 1.01)
Region of residence (vs North Rhine-Westphalia)
 North-west0.99 (0.66 to 1.32)0.96 (0.58 to 1.33)1.00 (0.61 to 1.38)
 South-west1.14 (0.78 to 1.49)1.11 (0.69 to 1.53)1.11 (0.70 to 1.52)
 Bavaria0.71 (0.46 to 0.96)0.71 (0.41 to 1.00)0.72 (0.43 to 1.02)
 North-east1.36 (0.83 to 1.90)1.34 (0.69 to 2.00)1.40 (0.74 to 2.06)
 Saxony, Thuringia1.57 (1.03 to 2.10)1.89 (1.11 to 2.67)1.96 (1.17 to 2.76)
 Austria, other1.69 (0.73 to 2.64)1.79 (0.60 to 2.98)1.76 (0.60 to 2.91)
Parental socioeconomic status (vs middle)
 Low0.71 (0.53 to 0.89)0.83 (0.57 to 1.10)0.77 (0.54 to 1.00)
 High1.80 (1.32 to 2.27)1.47 (1.00 to 1.94)1.51 (1.04 to 1.98)
Family situation (vs ‘classic’ family)
 Single parent0.71 (0.49 to 0.93)0.90 (0.55 to 1.26)
 Other or unknown0.80 (0.51 to 1.09)1.09 (0.61 to 1.56)
Immigration background0.55 (0.30 to 0.80)0.53 (0.22 to 0.85)
Single child0.92 (0.68 to 1.16)0.81 (0.55 to 1.07)
School-related variables
Advanced secondary education1.78 (1.40 to 2.17)1.60 (1.17 to 2.03)1.53 (1.13 to 1.94)
Periods off school (vs never or very rarely)
 Occasionally1.24 (0.95 to 1.52)1.15 (0.82 to 1.48)1.21 (0.89 to 1.54)
 Often0.82 (0.56 to 1.09)0.88 (0.52 to 1.24)0.78 (0.48 to 1.08)
Perceived compromised by inflammatory bowel disease at school (vs not compromised)
 Slightly, occasionally1.10 (0.86 to 1.33)1.06 (0.77 to 1.36)
 Substantially, frequently0.77 (0.53 to 1.01)0.72 (0.42 to 1.01)
Health-related variables
Age diagnosis/disease duration (vs 10+, >2 years duration)*
 0–5 versus 10+2.03 (1.31 to 2.74)1.37 (0.75 to 2.00)1.37 (0.75 to 1.99)
 6–9 versus 10+1.38 (1.01 to 1.75)0.94 (0.63 to 1.25)0.95 (0.64 to 1.25)
 10+,<2 years duration1.49 (1.09 to 1.90)1.16 (0.77 to 1.54)1.15 (0.77 to 1.53)
Poor or moderate current health status (vs good health)0.95 (0.75 to 1.15)1.24 (0.89 to 1.58)1.14 (0.84 to 1.44)
Active disease course (vs remission during preceding 12 months)0.99 (0.79 to 1.18)1.06 (0.76 to 1.36)1.02 (0.75 to 1.30)
  • Due to the inclusion criteria, all children with early disease onset had long-standing disease. These variables were therefore combined to a single combination variable for multivariate analysis.