Table 2.

External validation—goodness-of-fit results from total, dimension, and item-level mappings by age and health status

Group	N	Mean		Min. Max				Correlation coefficient	R2	MAE	MSE	RMSE	Absolute errors < 0.05 (%)	Average error
		Observed	Predicted	Observed		Predicted
Panel A—Total score mapping
Total	1225	0.888	0.823	0.384	1	0.331	0.992	0.625	0.391	0.092	0.016	0.107	40.49	0.065
0–12 months	9	0.902	0.881	0.857	1	0.783	0.976	0.140	0.020	0.069	0.006	0.082	33.33	0.021
13–24 months	18	0.922	0.861	0.710	1	0.658	0.975	0.783	0.613	0.064	0.008	0.067	61.11	0.061
2–4 years	333	0.912	0.878	0.581	1	0.393	0.992	0.593	0.352	0.069	0.009	0.088	49.55	0.034
5–7 years	252	0.892	0.811	0.507	1	0.429	0.992	0.337	0.581	0.102	0.019	0.111	36.51	0.081
8–12 years	413	0.878	0.796	0.384	1	0.380	0.992	0.618	0.382	0.105	0.020	0.114	35.59	0.082
13–17 years	200	0.861	0.798	0.481	1	0.331	0.992	0.661	0.437	0.095	0.016	0.109	39.00	0.063
Asthma only	323	0.880	0.827	0.464	1	0.396	0.992	0.605	0.366	0.085	0.014	0.105	42.11	0.052
Constipation only	194	0.873	0.810	0.504	1	0.380	0.992	0.701	0.492	0.093	0.015	0.105	37.63	0.063
Eczema only	433	0.911	0.852	0.467	1	0.393	0.992	0.564	0.318	0.086	0.014	0.105	45.27	0.059
Multimorbidity	275	0.872	0.783	0.384	1	0.331	0.992	0.627	0.394	0.111	0.021	0.112	33.09	0.090
Panel B—Dimension score mapping
Total	1198	0.887	0.873	0.384	1	0.249	0.988	0.634	0.402	0.071	0.010	0.098	51.59	0.014
2–4 years	333	0.912	0.953	0.581	1	0.748	0.988	0.532	0.283	0.059	0.007	0.072	58.86	− 0.042
5–7 years	252	0.892	0.899	0.507	1	0.656	0.982	0.663	0.439	0.056	0.006	0.079	61.11	− 0.007
8–12 years	413	0.878	0.841	0.384	1	0.339	0.975	0.693	0.480	0.073	0.010	0.092	48.91	0.037
13–17 years	200	0.861	0.774	0.481	1	0.249	0.956	0.721	0.520	0.106	0.019	0.107	33.00	0.086
Asthma only	322	0.879	0.861	0.464	1	0.339	0.988	0.687	0.472	0.067	0.008	0.089	51.55	0.018
Constipation only	188	0.871	0.881	0.504	1	0.249	0.988	0.671	0.450	0.070	0.010	0.099	52.66	− 0.010
Eczema only	415	0.911	0.905	0.467	1	0.433	0.988	0.535	0.286	0.065	0.008	0.092	57.59	0.007
Multimorbidity	273	0.872	0.835	0.384	1	0.339	0.987	0.626	0.392	0.085	0.013	0.110	41.76	0.037
Panel C—Item-level mapping
Total	842	0.877	0.809	0.384	1	0.372	1	0.616	0.379	0.098	0.017	0.112	37.05	0.069
5–7 years	245	0.891	0.813	0.507	1	0.410	1	0.535	0.286	0.104	0.020	0.119	37.96	0.078
8–12 years	404	0.878	0.807	0.384	1	0.434	1	0.642	0.412	0.098	0.017	0.110	35.64	0.071
13–17 years	193	0.860	0.807	0.481	1	0.372	1	0.660	0.436	0.089	0.014	0.107	38.86	0.052
Asthma only	275	0.874	0.832	0.464	1	0.464	1	0.590	0.348	0.084	0.013	0.108	42.55	0.043
Constipation only	95	0.844	0.777	0.504	1	0.380	1	0.731	0.535	0.097	0.015	0.103	31.58	0.066
Eczema only	249	0.907	0.827	0.467	1	0.481	1	0.533	0.284	0.101	0.020	0.116	38.96	0.080
Multimorbidity	223	0.863	0.774	0.384	1	0.372	1	0.652	0.425	0.111	0.021	0.113	30.49	0.089