Table 1 General characteristics of the participants.

From: Association of weekend catch-up sleep ratio and subjective sleep quality with depressive symptoms and suicidal ideation among Korean adolescents

	Depressive symptoms								Suicidal ideation
	Male (n = 136,316)				Female (n = 134,303)				Male (n = 136,316)				Female (n = 134,303)
	Total	Yes		P-value	Total	Yes		P-value	Total	Yes		P-value	Total	Yes		P-value
	N	N	%	P-value	N	N	%	P-value	N	N	%	P-value	N	N	%	P-value
Total (n = 270,619)	136,316	27,448	20.1		134,303	41,292	30.7		136,316	12,279	9.0		134,303	20,535	15.3
Weekend catch-up sleep ratio^a				< 0.001				< 0.001				< 0.001				< 0.001
CUS < 1.00	19,551	4005	20.5		11,123	3740	33.6		19,551	1993	10.2		11,123	2115	19.0
1.00 ≤ CUS < 1.50	87,682	16,471	18.8		81,045	23,202	28.6		87,682	7263	8.3		81,045	11,339	14.0
CUS ≥ 1.50	29,083	6972	24.0		42,135	14,350	34.1		29,083	3023	10.4		42,135	7081	16.8
Subjective sleep quality				< 0.001				< 0.001				< 0.001				< 0.001
Poor	48,455	13,884	28.7		66,880	25,483	38.1		48,455	6576	13.6		66,880	13,114	19.6
Moderate	46,204	8487	18.4		42,536	11,093	26.1		46,204	3550	7.7		42,536	5281	12.4
Good	41,657	5077	12.2		24,887	4716	18.9		41,657	2153	5.2		24,887	2140	8.6
Sleep duration (h)^b				< 0.001				< 0.001				< 0.001				< 0.001
Duration < 5	7650	2440	31.9		12,817	5474	42.7		7650	1262	16.5		12,817	2930	22.9
5 ≤ Duration < 7	54,582	12,814	23.5		63,715	20,953	32.9		54,582	5673	10.4		63,715	10,258	16.1
7 ≤ Duration < 9	61,075	10,170	16.7		49,718	12,786	25.7		61,075	4450	7.3		49,718	6319	12.7
Duration ≥ 9	11,011	1631	14.8		6738	1654	24.5		11,011	749	6.8		6738	824	12.2
School year				< 0.001				< 0.001				< 0.001				< 0.001
Mid1 (Grade 7)	21,065	3356	15.9		21,090	5398	25.6		21,065	1659	7.9		21,090	3117	14.8
Mid2 (Grade 8)	21,814	3904	17.9		21,672	6545	30.2		21,814	2018	9.3		21,672	3711	17.1
Mid3 (Grade 9)	22,950	4573	19.9		22,956	7179	31.3		22,950	2200	9.6		22,956	3861	16.8
High1 (Grade 10)	22,845	4672	20.5		22,242	6664	30.0		22,845	1941	8.5		22,242	3116	14.0
High2 (Grade 11)	23,735	5322	22.4		22,638	7527	33.2		23,735	2258	9.5		22,638	3459	15.3
High3 (Grade 12)	23,907	5621	23.5		23,705	7979	33.7		23,907	2203	9.2		23,705	3271	13.8
Economic status				< 0.001				< 0.001				< 0.001				< 0.001
Low	3757	1322	35.2		3164	1529	48.3		3757	786	20.9		3164	969	30.6
Medium–low	15,745	4071	25.9		16,797	6587	39.2		15,745	2091	13.3		16,797	3817	22.7
Medium	61,109	11,378	18.6		66,691	19,359	29.0		61,109	4862	8.0		66,691	9202	13.8
Medium–high	39,427	7495	19.0		37,207	10,840	29.1		39,427	3143	8.0		37,207	5122	13.8
High	16,278	3182	19.5		10,444	2977	28.5		16,278	1397	8.6		10,444	1425	13.6
Residence type				< 0.001				< 0.001				< 0.001				< 0.001
Live w/o family or relative	6302	1557	24.7		5503	1822	33.1		6302	676	10.7		5503	857	15.6
Live with relative	948	301	31.8		786	370	47.1		948	172	18.1		786	222	28.2
Live with family	129,066	25,590	19.8		128,014	39,100	30.5		129,066	11,431	8.9		128,014	19,456	15.2
Academic achievement				< 0.001				< 0.001				< 0.001				< 0.001
Low	14,205	3876	27.3		12,009	5121	42.6		14,205	1847	13.0		12,009	2873	23.9
Medium–low	29,622	6632	22.4		31,125	10,888	35.0		29,622	2998	10.1		31,125	5461	17.5
Medium	37,937	7168	18.9		40,336	11,847	29.4		37,937	3112	8.2		40,336	5467	13.6
Medium–high	33,967	6234	18.4		35,528	9604	27.0		33,967	2699	7.9		35,528	4719	13.3
High	20,585	3538	17.2		15,305	3832	25.0		20,585	1623	7.9		15,305	2015	13.2
Alcohol status				< 0.001				< 0.001				< 0.001				< 0.001
Ever	60,149	15,470	25.7		47,097	18,841	40.0		60,149	6906	11.5		47,097	9791	20.8
Never	76,167	11,978	15.7		87,206	22,451	25.7		76,167	5373	7.1		87,206	10,744	12.3
Smoking status				< 0.001				< 0.001				< 0.001				< 0.001
Everyday	9024	3107	34.4		2360	1342	56.9		9024	1362	15.1		2360	740	31.4
Some day	19,173	5106	26.6		7629	3709	48.6		19,173	2336	12.2		7629	2165	28.4
Never	108,119	19,235	17.8		124,314	36,241	29.2		108,119	8581	7.9		124,314	17,630	14.2
Physical activity				< 0.001				< 0.001				< 0.001				< 0.001
Low	56,134	10,764	19.2		92,236	27,728	30.1		56,134	5246	9.3		92,236	13,514	14.7
High	80,182	16,684	20.8		42,067	13,564	32.2		80,182	7033	8.8		42,067	7021	16.7
Self-reported health status				< 0.001				< 0.001				< 0.001				< 0.001
Low	6915	2622	37.9		10,402	5644	54.3		6915	1699	24.6		10,402	3659	35.2
Medium	24,503	6374	26.0		34,433	13,152	38.2		24,503	3290	13.4		34,433	6974	20.3
High	104,898	18,452	17.6		89,468	22,496	25.1		104,898	7290	6.9		89,468	9902	11.1
Perception of stress				< 0.001				< 0.001				< 0.001				< 0.001
Low	34,481	1956	5.7		18,385	1272	6.9		34,481	596	1.7		18,385	443	2.4
Medium	60,140	8961	14.9		54,611	10,555	19.3		60,140	2798	4.7		54,611	3558	6.5
High	41,695	16,531	39.6		61,307	29,465	48.1		41,695	8885	21.3		61,307	16,534	27.0

^aWeekend sleep duration/weekday sleep duration.
^bAverage sleep duration of weekday and weekend.

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Table 1 General characteristics of the participants.

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