Association between night work and dyslipidemia in South Korean men and women: a cross-sectional study

Joo, Jae Hong; Lee, Doo Woong; Choi, Dong-Woo; Park, Eun-Cheol

doi:10.1186/s12944-019-1020-9

Lipids in Health and Disease

Table 1 General characteristics of the study population

From: Association between night work and dyslipidemia in South Korean men and women: a cross-sectional study

Variables	Dyslipidemia
	Male									Female
	TOTAL		Yes		No		P-value	TOTAL		Yes		No		P-value
	N	%	N	%	N	%	P-value	N	%	N	%	N	%	P-value
Work pattern							0.004							0.252
Day	2404	85.2	684	28.5	1720	71.5		2512	84.0	382	15.2	2130	84.8
Night	196	6.9	76	38.8	120	61.2		379	12.7	70	18.5	309	81.5
Other shifts	221	7.8	56	25.3	165	74.7		101	3.4	17	16.8	84	83.2
Age(years)							0.011							<.0001
30~39	741	26.3	210	28.3	531	71.7		830	27.7	85	10.2	745	89.8
40~49	738	26.2	236	32.0	502	68.0		997	33.3	119	11.9	878	88.1
50~59	634	22.5	196	30.9	438	69.1		742	24.8	163	22.0	579	78.0
≥ 60	708	25.1	174	24.6	534	75.4		423	14.1	102	24.1	321	75.9
Region							0.586							0.314
Metropolitan	1696	60.1	497	29.3	1199	70.7		1861	62.2	282	15.2	1579	84.8
Rural	1125	39.9	319	28.4	806	71.6		1131	37.8	187	16.5	944	83.5
Educational level							0.348							<.0001
≤ Highschool	1541	54.6	457	29.7	1084	70.3		1812	60.6	343	18.9	1469	81.1
≥ College	1280	45.4	359	28.0	921	72.0		1180	39.4	126	10.7	1054	89.3
Occupational categoriesª							0.156							<.0001
White	1085	38.5	336	31.0	749	69.0		1275	42.6	144	11.3	1131	88.7
Pink	355	12.6	101	28.5	254	71.5		859	28.7	157	18.3	702	81.7
Blue	1381	49.0	379	27.4	1002	72.6		858	28.7	168	19.6	690	80.4
Household income							0.179							<.0001
Low	272	9.6	79	29.0	193	71.0		295	9.9	75	25.4	220	74.6
Mid-low	679	24.1	184	27.1	495	72.9		701	23.4	115	16.4	586	83.6
Mid-high	910	32.3	251	27.6	659	72.4		908	30.3	121	13.3	787	86.7
High	960	34.0	302	31.5	658	68.5		1088	36.4	158	14.5	930	85.5
Marital status							0.898							0.087
Living w/ spouse	2465	87.4	712	28.9	1753	71.1		2384	79.7	360	15.1	2024	84.9
Living w/o spouse	356	12.6	104	29.2	252	70.8		608	20.3	109	17.9	499	82.1
Eating habit(daily)							0.014							0.564
Regularly eat breakfast, lunch, and dinner	1772	62.8	484	27.3	1288	72.7		1625	54.3	249	15.3	1376	84.7
Skip meal(s)	1049	37.2	332	31.6	717	68.4		1367	45.7	220	16.1	1147	83.9
Physical activity							0.356							0.145
Active	1549	54.9	437	28.2	1112	71.8		1528	51.1	254	16.6	1274	83.4
Inactive	1272	45.1	379	29.8	893	70.2		1464	48.9	215	14.7	1249	85.3
Sleep duration(hours)							0.077							0.833
0~6	1460	51.8	401	27.5	1059	72.5		1570	52.5	244	15.5	1326	84.5
≥ 7	1361	48.2	415	30.5	946	69.5		1422	47.5	225	15.8	1197	84.2
Smoking status							<.0001							0.346
Current smoker	1046	37.1	352	33.7	694	66.3		135	4.5	17	12.6	118	87.4
Ex-smoker	1149	40.7	310	27.0	839	73.0		131	4.4	25	19.1	106	80.9
Non-smoker	626	22.2	154	24.6	472	75.4		2726	91.1	427	15.7	2299	84.3
Drinking status							0.097							0.001
≥ 2 times / month	2063	73.1	579	28.1	1484	71.9		1420	47.5	189	13.3	1231	86.7
Never	758	26.9	237	31.3	521	68.7		1572	52.5	280	17.8	1292	82.2
BMI^b							<.0001							< 0.0001
Obese(≥25)	809	28.7	257	31.8	552	68.2		564	18.9	129	22.9	435	77.1
Overweight(23~24.9)	855	30.3	291	34.0	564	66.0		667	22.3	138	20.7	529	79.3
Normal+underweight(< 23)	1157	41.0	268	23.2	889	76.8		1761	58.9	202	11.5	1559	88.5
Hypertension							0.102							< 0.0001
Hypertension	627	22.2	160	25.5	467	74.5		375	12.5	82	21.9	293	78.1
Pre-hypertension	897	31.8	269	30.0	628	70.0		601	20.1	111	18.5	490	81.5
Normal	1297	46.0	387	29.8	910	70.2		2016	67.4	276	13.7	1740	86.3
Diabetes							0.006							0.102
Diabetes mellitus	176	6.2	49	27.8	127	72.2		78	2.6	19	24.4	59	75.6
Impaired fasting glucose	641	22.7	154	24.0	487	76.0		400	13.4	62	15.5	338	84.5
Normal	2004	71.0	613	30.6	1391	69.4		2514	84.0	388	15.4	2126	84.6
Menopause														< 0.0001
Yes								834	27.9	193	23.1	641	76.9
No								2158	72.1	276	12.8	1882	87.2
Year							0.604							0.014
2013	747	26.5	216	28.9	531	71.1		764	25.5	119	15.6	645	84.4
2014	704	25.0	200	28.4	504	71.6		722	24.1	90	12.5	632	87.5
2015	668	23.7	206	30.8	462	69.2		689	23.0	129	18.7	560	81.3
2016	702	24.9	194	27.6	508	72.4		817	27.3	131	16.0	686	84.0
Calorie intake(Kcal)^c	2468.3	±1007.7	2466.7	±1106.9	2468.9	±964.3	0.958	1806.7	±712.2	1803.5	±753.0	1807.3	±704.2	0.914
Protein intake(g)^c	86.3	±60.3	88.3	±87.4	85.5	±44.8	0.259	62.8	±31.8	62.0	±30.8	62.9	±32.0	0.567
Fat intake(g)^c	53.1	±40.6	52.8	±46.5	53.2	±37.9	0.788	40.4	±28.6	37.2	±28.1	40.9	±28.7	0.010
Carbohydrate intake(g)^c	361.9	±132.9	358.9	±128.3	363.2	±134.8	0.439	286.8	±115.9	294.0	±128.4	285.4	±113.4	0.141
Total	2821	100.0	816	28.9	2005	71.1		2992	100.0	469	15.7	2523	84.3

BMI body mass index
^aThree groups based on International Standard Classification Occupations codes
^bObesity status defined by BMI based on 2014 Clinical Practice Guidelines for Overweight and Obesity in Korea
^cMean and Standard deviation (SD) of the continuous independent variables in this study

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