Table 2. Classification of STB groups (child-reported and parent-reported): Results of binomial penalized logistic regression analysis.

Comparison	Alpha	AUROC	SD AUROC	Sensitivity	Specificity	Accuracy	PPV	NPV
Child-reported STB
HC vs. CC						|
	0.25	0.687	0.022	0.692	0.578	0.635	0.621	0.652
	0.50	0.687	0.026	0.696	0.576	0.636	0.621	0.654
	0.75	0.689	0.029	0.695	0.575	0.635	0.621	0.653
	1.00	0.688	0.028	0.693	0.579	0.636	0.622	0.653
HC vs. STB
	0.25	0.795	0.042	0.688	0.768	0.728	0.748	0.711
	0.50	0.796	0.046	0.684	0.771	0.727	0.749	0.709
	0.75	0.796	0.049	0.681	0.761	0.721	0.740	0.705
	1.00	0.797	0.049	0.683	0.772	0.728	0.750	0.709
CC vs. STB
	0.25	0.705	0.054	0.593	0.693	0.643	0.659	0.630
	0.50	0.715	0.059	0.602	0.710	0.656	0.674	0.640
	0.75	0.705	0.058	0.599	0.696	0.648	0.663	0.635
	1.00	0.712	0.061	0.596	0.708	0.652	0.671	0.637
Parent-reported STB
HC vs. CC
	0.25	0.684	0.027	0.675	0.585	0.630	0.619	0.643
	0.50	0.686	0.028	0.678	0.586	0.632	0.621	0.645
	0.75	0.685	0.030	0.680	0.584	0.632	0.620	0.646
	1.00	0.686	0.026	0.676	0.588	0.632	0.621	0.645
HC vs. STB
	0.25	0.811	0.045	0.667	0.805	0.736	0.774	0.707
	0.50	0.809	0.048	0.672	0.794	0.733	0.765	0.708
	0.75	0.810	0.047	0.666	0.801	0.733	0.770	0.706
	1.00	0.808	0.048	0.668	0.789	0.729	0.760	0.704
CC vs. STB
	0.25	0.765	0.057	0.635	0.749	0.692	0.716	0.672
	0.50	0.769	0.052	0.642	0.760	0.701	0.728	0.680
	0.75	0.761	0.053	0.643	0.748	0.696	0.718	0.677
	1.00	0.774	0.049	0.649	0.760	0.704	0.730	0.684

Note: CC: clinical control group; HC: healthy control group; STB: suicidal thoughts and behaviours group, PPV: positive predictive value, NPV: negative predictive value