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. 2013 Feb 22;8(2):e57081. doi: 10.1371/journal.pone.0057081

Table 6. Comparison of two independent sets of healthy controls.

	1^st set		2^nd set
	No.	%	No.	%	P value
Gender					<0.0001
Male	31	40.3	61	77.2
Female	46	59.7	18	22.8
Smoking status
Current smoker	2	3.8	4	5.1	0.889
Past smoker	19	35.8	25	31.6
Never smoked	32	60.4	50	63.3
Second hand smoke					<0.0001
No	48	90.6	32	40.5
Yes	5	9.4	47	59.5
Alcohol					<0.0001
No	6	11.3	23	29.6
Yes	47	88.4	56	70.4
Age (Mean ± SD)	51.6±13.5		42.7±12.03		<0.0001
PLA₂ activities(Mean ± SD)
PLA₂	1135.9±266.2		1156.3±311.8		0.660
iPLA₂	1082.0±286.1		1105.4±301.6		0.620
cPLA₂	1246.1±318.7		1287.8±425.9		0.488
sPLA₂	299.1±164.7		293.9±137.3		0.828