Table 2.

Association between regular aspirin use and self-reported walking pace in 14,315 PHS participants before and after propensity score weighting

Group	Average annual aspirin use ≤60 d/year (n)	Average annual aspirin use >60 d/year (n)	Crude OR (95% CI)	p-value	OR after Propensity Score (95% CI)	p-value
Don’t walk regularly Overall n=1870	311	1559	Ref		Ref
Easy <2mph Overall n =1739	252	1487	1.18 (0.98 to 1.41)	0.08	1.16 (0.97 to 1.39)	0.38
Normal, ≥2–2.9mph Overall n =6314	912	5402	1.18 (1.03 to 1.36)	0.02	1.24 (1.08 to 1.43)	0.02
Brisk/Very Brisk ≥3mph Overall n =4392	581	3811	1.31 (1.13 to 1.52)	<0.01	1.40 (1.21 to 1.63)	0.03

Sample sizes are provided for each category to allow for calculation of the raw ORs. For example, comparing “normal” walkers with those who “don’t walk” the estimated unadjusted OR is 1.18, as shown in the table. This is interpreted as: for an individual in the high-aspirin group, the relative odds of being in the “normal” walking group than the “don’t walk” group are18% greater with high aspirin exposure vs low aspirin exposure.