Gender and age differences among current smokers in a general population survey

John, Ulrich; Hanke, Monika; Meyer, Christian; Schumann, Anja

doi:10.1186/1471-2458-5-57

BMC Public Health

Table 2 Mean age at onset of smoking and cigarettes per day by age*

From: Gender and age differences among current smokers in a general population survey

	Women		Men			T Chi²	P	Effect size
	n ever smokers	mean % current smokers within ever smokers	n ever smokers	mean % current smokers within ever smokers	mean difference (standard error)
Total
Age
10 – 19
mean age at onset (SD) cigarettes per day	1303	15.2 (1.6)	1663	15.4 (1.6)	0.2 (0.1)	-2.7	.01	0.10
4 or less %	430	89.1	496	91.1		1.1	ns
5 – 20 %	854	95.4	1174	97.8		8.7	.01	.07
21 or more %	55	87.3	71	97.2		4.7	.05	.19
20 – 29
mean age at onset (SD) cigarettes per day	4419	16.7 (2.6)	5367	16.8 (2.5)	0.1 (0.1)	-1.7	ns	0.04
4 or less %	1104	69.3	796	75.9		10.1	.01	.07
5 – 20 %	3142	81.9	4029	87.7		46.6	.001	.08
21 or more %	356	83.1	741	88.5		5.9	.05	.07
30 – 39
mean age at onset (SD) cigarettes per day	7493	17.3 (3.4)	8976	17.0 (3.2)	0.2 (0.1)	4.1	.001	0.06
4 or less %	1639	58.3	996	62.9		5.3	.05	.04
5 – 20 %	5365	72.2	6420	75.5		16.3	.001	.04
21 or more %	782	79.8	1831	79.2		0.1	ns
40 – 49
mean age at onset (SD) cigarettes per day	6464	18.4 (4.5)	8769	17.5 (3.7)	1.0 (0.1)	13.9	.001	0.23
4 or less %	1248	51.3	836	48.8		1.2	ns
5 – 20 %	4646	68.0	5674	65.7		6.0	.05	.02
21 or more %	802	72.6	2235	67.8		6.3	.05	.04
50 – 59
mean age at onset (SD) cigarettes per day	4156	21.1 (6.6)	7454	18.5 (4.8)	2.7 (0.1)	23.0	.001	0.48
4 or less %	911	42.2	729	42.5		0.2	ns
5 – 20 %	2867	61.8	4736	52.1		69.5	.001	.10
21 or more %	543	61.9	1829	50.8		20.7	.001	.09
60 – 69
mean age at onset (SD) cigarettes per day	2618	24.3 (9.0)	6825	19.3 (6.1)	5.0 (0.2)	26.2	.001	0.68
4 or less %	702	36.5	803	35.0		0.4	ns
5 – 20 %	1795	55.0	4310	38.6		138.5	.001	.15
21 or more %	225	48.0	1382	31.6		22.2	.001	.12
70 – 79
mean age at onset (SD) cigarettes per day	1848	25.4 (10.2)	4060	20.0 (6.6)	5.5 (0.3)	21.1	.001	0.66
4 or less %	662	23.6	601	23.3		0.0	ns
5 – 20 %	1174	40.5	2515	22.6		123.2	.001	.18
21 or more %	107	33.6	564	15.6		17.1	.001	.17
80 or older
mean age at onset (SD) cigarettes per day	440	26.5 (11.5)	956	21.4 (7.5)	5.1 (0.6)	8.5	.001	0.55
4 or less %	198	24.2	174	20.1		0.9	ns
5 – 20 %	240	32.9	540	18.0		20.4	.001	.16
21 or more %	27	51.9	114	9.6		22.0	.001	.44

* Means for current smokers; % current smokers within ever smokers.
T T score for t-test of means.
Chi² Likelihood chi² test result for proportions.
P Significance level: .001 ≤ .001, .01 ≤ .01, .05 ≤ .05, ns not significant.
Effect size Cohen's w for proportions and d for differences between means [15].
SD Standard deviation.

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ISSN: 1471-2458

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