Table 1.

Descriptive analysis of items.

Item	Wave 1 (N = 5,797)					Wave 2 (N = 6,512)
		Mean	SD	Skewness	Kurtosis	Item-rest correlation	Mean	SD	Skewness	Kurtosis	Item-rest correlation
A1	1.493	0.773	1.713	2.574	0.777	1.574	0.829	1.501	1.653	0.784
A2	1.343	0.687	2.291	5.168	0.77	1.444	0.761	1.845	2.928	0.795
A3	1.472	0.743	1.715	2.696	0.781	1.559	0.798	1.522	1.901	0.797
A4	1.47	0.76	1.752	2.699	0.743	1.533	0.804	1.583	1.962	0.758
A5	1.335	0.689	2.311	5.135	0.611	1.351	0.713	2.237	4.61	0.637
A6	1.482	0.706	1.583	2.518	0.598	1.533	0.758	1.511	2.025	0.622
A7	1.343	0.669	2.24	5.089	0.693	1.383	0.712	2.072	4.051	0.716
D1	1.835	0.371	−1.803	1.251	0.613	1.813	0.39	−1.604	0.574	0.621
D2	1.781	0.414	−1.357	−0.157	0.591	1.75	0.433	−1.154	−0.668	0.623
D3	1.558	0.497	−0.233	−1.946	0.345	1.526	0.499	−0.103	−1.99	0.38
D4	1.814	0.389	−1.613	0.603	0.576	1.845	0.362	−1.908	1.641	0.573
D5	1.843	0.364	−1.888	1.566	0.471	1.823	0.381	−1.695	0.874	0.476
D6	1.18	0.384	1.669	0.784	0.598	1.82	0.384	−1.669	0.784	0.608
D7	1.787	0.409	−1.403	−0.03	0.564	1.702	0.457	−0.885	−1.218	0.576
L1	1.367	0.587	1.359	0.811	0.726	1.391	0.607	1.296	0.597	0.741
L2	1.332	0.543	1.38	0.944	0.71	1.34	0.55	1.363	0.893	0.707
L3	1.419	0.61	1.164	0.29	0.708	1.454	0.629	1.065	0.041	0.712

A1–A7, GAD-7 Scale items; D1–D7, CES-D Scale items; L1–L3, UCLA Loneliness Scale items.