Regression results
| Girls | Boys | |||||
| Model | Model 1 | Model 2 | Model 3 | Model 1 | Model 2 | Model 3 |
| Constant | −0.583*** (−0.633 to −0.532) | −0.722*** (−0.798 to −0.647) | −1.033*** (−1.112 to −0.953) | −1.122*** (−1.157 to 1.087) | −1.137*** (−1.226 to −1.047) | −1.416*** (−1.498 to −1.333) |
| Fixed effects | ||||||
| Year (Ref. 1988) | ||||||
| 1991 | 0.003 (−0.083 to 0.088) | 0.004 (−0.082 to 0.091) | −0.056 (−0.182 to 0.069) | −0.075 (−0.187 to 0.036) | ||
| 1995 | 0.078† (−0.009 to 0.166) | −0.030 (−0.117 to 0.058) | −0.017 (−0.145 to 0.110) | −0.142* (−0.255 to −0.029) | ||
| 1998 | 0.112* (0.026 to 0.199) | 0.018 (−0.067 to 0.105) | 0.018 (−0.111 to 0.147) | −0.065 (−0.178 to 0.050) | ||
| 2002 | 0.187*** (0.101 to 0.274) | 0.159*** (0.072 to 0.245) | 0.024 (−0.104 to 0.152) | −0.018 (−0.131 to 0.096) | ||
| 2005 | 0.311*** (0.226 to 0.396) | 0.250*** (0.164 to 0.336) | 0.070 (−0.056 to 0.195) | 0.068 (−0.044 to 0.180) | ||
| 2008 | 0.286*** (0.201 to 0.372) | 0.259*** (0.173 to 0.345) | 0.062 (−0.064 to 0.188) | 0.085 (−0.027 to 1.669) | ||
| Worry (Ref. never) | ||||||
| Rarely | 0.275*** (0.221 to 0.330) | 0.367*** (0.312 to 0.422) | ||||
| Sometimes | 0.569*** (0.512 to 0.625) | 0.738*** (0.067 to 0.804) | ||||
| Often | 0.989*** (0.909 to 1.069) | 0.915*** (0.807 to 1.023) | ||||
| Always | 1.088*** (0.971 to 1.205) | 1.494*** (1.320 to 1.669) | ||||
| Random effects (variance) | ||||||
| At municipality level | 0.004 (0.000 to 0.031) | 0.007 (0.002 to 0.021) | 0.006 (0.002 to 0.018) | 0.000 (0.000 to 2751.354) | 0.000 (0.000 to 123.300) | 0.000 (0.000 to 0.006) |
| At time level | 0.022 (0.013 to 0.039) | 0.000 (0.000 to 6468.145) | 0.001 (0.000 to 0.094) | 0.013 (0.006 to 0.026) | 0.011 (0.005 to 0.025) | 0.007 (0.003 to 0.019) |
| At individual level | 1.136 (1.103 to 1.171) | 1.139 (1.105 to 1.174) | 1.023 (0.997 to 1.059) | 1.351 (1.310 to 1.393) | 1.350 (1.311 to 1.391) | 1.233 (1.197 to 1.270) |
| Intraclass correlation | ||||||
| At municipality level | 0.003 (0.000 to 0.026) | 0.000 (0.000 to 0.000) | ||||
| At time level | 0.022 (0.014 to 0.036) | 0.009 (0.005 to 0.019) | ||||
The coefficients for the fixed effects are unstandardised beta coefficients and represent the change in the level of psychosomatic problems compared with the reference category. Multilevel units are 14 municipalities and 7 time points. All the effects indicated as having a zero value in the table did exceed zero although by very little. †P<0.10 * P<.05 *** P<.001