With slope estimates for 2010, 2011 and 2012 fixed | With slope estimate for 2011 allowed to vary | |||
---|---|---|---|---|

Parameters of the growth curve | Coefficient | SE | Coefficient | SE |

Intercept mean | 4.07*** | 0.12 | 4.08*** | 0.12 |

Intercept variance | 15.14*** | 0.99 | 16.50 | 15.33 |

Slope mean | −0.02 | 0.06 | −0.02 | 0.06 |

Slope variance | 1.61*** | 0.41 | 1.68 | 2.47 |

Intercept–slope correlation | −0.252 | −0.192 | ||

Model fit statistics | ||||

RMSEA† | 0.001 | 0.001 | ||

χ^{2} | 0.057 | 1597.6 | ||

p | 0.8118 | 0.001 | ||

CFI‡ | 1.000 | 1.000 | ||

TLI | 1.000 | 1.000 | ||

SRMR | 0.001 | 0.001 |

For further information on the model fit statistics, see online supplementary additional file 1.

***p<0.001, **p<0.01, *p<0.05, NS p>0.05.

†Should be <0.08.

‡Should be close to 1.

AIC, Akaike Information Criterion; CFI, comparative fit index; RMSEA, root mean square error of approximation; NS, not significant; SRMR, standardised root mean square residual; TLI, Tucker-Lewis index.