. 2020 Jun 11;8:177. doi: 10.3389/fpubh.2020.00177

Table 2.

Smoking patterns, stratified by smoking status among male subjects in Hebei Province, central China, 2017.

	Ever-smoker		Current smoker		Ex-smoker		Cessation because of		Cessation by choice
	(n = 1,748)		(n = 1,265)		(n = 483)		illness (n = 244)		(n = 235)
Smoking started age (year, mean, SD)	20.95	6.25	21.39	7.03	21.78^a	6.59	22.03	6.29	21.56	6.93
Categories (n, %)
<15	98	5.61	84	6.64	14	2.90^a	3	1.23	11	4.68
15–19	634	36.27	471	37.23	163	33.75	79	32.38	83	35.32
20–29	844	48.28	590	46.64	254	52.59	134	54.92	117	49.79
>30	172	9.84	120	9.49	52	10.77	28	11.48	24	10.21
Smoking duration (years, mean, SD)	25.69	13.10	26.58	13.36	23.01^a	13.00	26.49	12.75	19.55	12.30
Categories (n, %)
<5	68	3.89	35	2.77	33	6.83^a	11	4.51	21	8.94^b
5–9	141	8.07	101	7.98	40	8.28	11	4.51	28	11.91
10–19	392	22.43	272	21.50	120	24.84	48	19.67	70	29.79
20–29	424	24.26	306	24.19	118	24.43	59	24.18	59	25.11
>30	718	41.08	551	43.56	167	34.58	111	45.49	56	23.83
Daily cigarette consumption (mean, SD)	16.61	10.72	15.95	9.99	16.81	12.83	18.11	12.90	15.48	12.70
Categories (n, %)
≤ 10	749	42.85	218	45.13	531	41.98	96	39.34	120	51.06^b
11–19	772	44.16	197	40.79	575	45.45	108	44.26	87	37.02
>20	227	12.99	68	14.08	159	12.57	40	16.39	28	11.91
Duration from quit smoking to current time (years, mean, SD)	NA	NA	NA	NA	12.05	10.15	10.81	9.54	13.25	10.46
Categories (n, %)
<2	NA	NA	NA	NA	36	7.45	20	8.20	16	6.81^b
2–4	NA	NA	NA	NA	107	22.15	62	25.41	44	18.72
5–9	NA	NA	NA	NA	81	16.77	47	19.26	34	14.47
≥10	NA	NA	NA	NA	245	50.72	107	43.85	135	57.45

p < 0.01 of the comparison between current smoker and ex-smoker;

p < 0.05 of the comparison between people quit smoking because of illness and people quit smoking by choice. The sums of the proportion in some columns were not equal to 100% because of missing values. NA, not applicable.