Cigarette smoking and its association with serum lipid/lipoprotein among Chinese nonagenarians/centenarians

Table 1 Comparing the age, gender, FBG and serum lipid/lipoprotein between subjects with smoking and non-smoking habit, and among groups with different smoking quantity (n = 661)

Characteristics	Smoking status				Smoking dosage
	Smoker n = 273	Non-smoker n = 388	χ 2 ort	P value	Light n = 146	Medium n = 90	Heavy n = 37	χ 2 orF	P value
Age (years)	93.37 ± 3.22	93.62 ± 3.47	0.944	0.346	93.52 ± 3.20	93.23 ± 3.13	93.11 ± 3.56	0.362	0.697
Gender ^a
(Male/Female)	145/128	71/317	87.88	≤0.001*	65/81	58/32	22/15	9.567	0.008*
TG (mmol/L)	1.21 ± 0.56	1.23 ± 0.69	0.492	0.623	1.20 ± 0.52	1.24 ± 0.63	1.16 ± 0.56	0.327	0.721
TC (mmol/L)	4.05 ± 0.81	4.21 ± 0.87	2.403	0.017	4.07 ± 0.75	4.11 ± 0.90	3.82 ± 0.77	1.778	0.171
HDL (mmol/L)	1.54 ± 0.62	1.60 ± 0.56	1.224	0.222	1.49±	1.54±	1.52±	1.716	0.182
LDL (mmol/L)	2.21 ± 0.55	2.28 ± 0.63	1.443	0.149	2.23 ± 0.55	2.23 ± 0.57	2.06 ± 0.49	1.535	0.217
FBG (mmol/L)	4.43 ± 1.58	4.48 ± 1.36	0.389	0.697	4.39 ± 1.54	4.45 ± 1.53	4.58 ± 1.82	0.218	0.814
Abnormal Serum Lipid/Lipoprotein
TG	33/240	56/332	0.756	0.226	16/130	11/79	6/31	0.770	0.680
TC	24/249	51/337	3.019	0.049*	11/135	11/79	2/35	2.138	0.350
HDL	19/254	18/370	1.633	0.135	11/135	6/84	2/35	0.224	0.894
LDL	10/263	25/363	2.470	0.080	5/141	5/85	0/37	2.344	0.310

Comparing the age, gender, FBG and Serum Lipid/Lipoprotein between subjects with smoking and non-smoking habit, and among groups with different smoking quantity, Using χ² or Fisher’s exact test (where^a an expected cell count was < 5) for categorical variables and unpaired Student’s t test for continuous variables. In the testing, a P value < 0.05 was considered to be statistically significant. * P < 0.05 ** P < 0.01. FBG, fasting blood glucose; HDL, high density lipoprotein; LDL, low density lipoprotein; TC: Total cholesterol; TG: Triglyceride.