Table 1.

Effect of phosphatidylcholine on lifespan of C. elegans.

	PC (mg/l)	Mean lifespan (day)	P value1	% effect2
1st experiment	0	13.8
	10	17.7	<0.001	28.8
	100	16.8	<0.001	22.2
2nd experiment	0	18.6
	10	21.8	<0.001	17.3
	100	20.3	0.021	9.2
3rd experiment	0	18.7
	10	20.1	0.078	7.2
	100	21.3	0.001	13.6

¹ P value was calculated using the log-rank test by comparing the survival rate of the untreated control group (0 mg/l phosphatidylcholine) to that of the phosphatidylcholine-treated group (10 or 100 mg/L phosphatidylcholine). ²% effects were calculated by (C − p)/C ^∗100, where p is the mean lifespan of the phosphatidylcholine-treated group and C is the mean lifespan of the untreated control group. PC: phosphatidylcholine.