Table 2

Improvements in body weight during military service according to general characteristics

	n	Maintenance		Improvement		Deterioration		P value*
	n	n	%	n	%	n	%	P value*
Age (years)								0.2169
<20	69	38	55.1	20	29.0	11	15.9
20–21	1521	850	55.9	447	29.4	224	14.7
≥22	382	218	57.1	93	24.4	71	18.6
Educational level								0.0621
High school	288	151	52.4	79	27.4	58	20.1
College or above	1684	955	56.7	481	28.6	248	14.7
Smoking status								0.8001
Non-smoker	1039	575	55.3	295	28.4	169	16.3
Ex-smoker	173	103	59.5	47	27.2	23	13.3
Current smoker	760	428	56.3	218	28.7	114	15.0
Subjective health status								0.0004
Good	1148	669	58.3	329	28.7	150	13.1
Normal	677	371	54.8	188	27.8	118	17.4
Poor	147	66	44.9	43	29.3	38	25.9
Physical activity (MET-min/week)								0.7800
<600	376	210	55.9	104	27.7	62	16.5
600–3000	661	369	55.8	183	27.7	109	16.5
>3000	935	527	56.4	273	29.2	135	14.4
Strength training								0.0024
None	436	225	51.6	129	29.6	82	18.8
1–2 times per week	460	249	54.1	123	26.7	88	19.1
≥3 times per week	1076	632	58.7	308	28.6	136	12.6
Sleep duration (hours/day)								0.2552
<6	59	41	69.5	10	17.0	8	13.6
6–7	1273	714	56.1	360	28.3	199	15.6
≥8	640	351	54.8	190	29.7	99	15.5
Sleep disturbance								0.4993
No	1724	963	55.9	497	28.8	264	15.3
Yes	248	143	57.7	63	25.4	42	16.9
Stress								0.5259
None	534	304	56.9	146	27.3	84	15.7
Moderate	893	512	57.3	252	28.2	129	14.5
Severe	545	290	53.2	162	29.7	93	17.1
Depression								0.6554
No	1915	1074	56.1	546	28.5	295	15.4
Yes	57	32	56.1	14	24.6	11	19.3
Total	1972	1106	56.1	560	28.4	306	15.5