Table 2.

Air pollution, temperature, and water vapor pressure among all observations (24-hr average and 5-day average values before each study visit).

Variable	Observations (n)	Mean	Percentile			Maximum	IQR
			25th	50th	75th
Ambient PM2.5 (μg/m3)
24 hr	278	8.37	5.52	7.38	9.58	26.69	4.06
5 day	279	8.51	6.47	7.61	9.62	21.10	3.14
Indoor continuous PM2.5 (μg/m3)
24 hr	258	7.11	3.73	5.04	7.96	56.43	4.23
5 day	260	8.93	5.02	7.11	10.51	52.88	5.49
Home/trip–integrated PM2.5 (μg/m3)
5 day	269	9.18	5.05	7.74	10.70	57.28	5.66
Ambient BC (μg/m3)
24 hr	279	0.61	0.41	0.54	0.76	2.62	0.35
5 day	279	0.60	0.48	0.57	0.73	1.25	0.25
Home/trip–integrated BC (μg/m3)
5 day	268	0.77	0.56	0.69	0.84	4.89	0.28
OC (μg/m3)
24 hr	231	3.03	2.07	2.85	3.82	8.91	1.75
5 day	245	3.03	2.17	2.98	3.78	6.24	1.61
EC (μg/m3)
24 hr	231	0.35	0.24	0.30	0.44	0.96	0.20
5 day	245	0.34	0.27	0.34	0.41	0.80	0.14
CO (ppm)
24 hr	279	0.28	0.21	0.27	0.34	1.00	0.13
5 day	279	0.28	0.23	0.28	0.33	0.52	0.10
NO2 (ppm)
24 hr	279	0.015	0.011	0.015	0.018	0.033	0.006
5 day	279	0.015	0.012	0.014	0.016	0.025	0.004
O3 (ppm)
24 hr	279	0.027	0.020	0.026	0.032	0.061	0.012
5 day	279	0.028	0.022	0.028	0.033	0.047	0.010
PN (1,000/cm3)
24 hr	262	13.27	9.03	12.47	17.21	32.67	8.18
5 day	265	12.95	8.92	12.43	16.16	28.39	7.24
SO42– (μg/m3)
24 hr	197	2.13	0.95	1.61	2.41	12.34	1.47
5 day	221	2.28	1.37	1.82	2.72	7.08	1.34
Temperature (°C)
24 hr	279	13.71	6.84	14.78	21.20	29.33	14.36
5 day	279	13.68	6.84	15.10	20.99	26.39	14.15
Water vapor pressure (hPa)
24 hr	279	11.41	6.18	10.53	16.32	24.99	10.14
5 day	279	11.49	6.72	10.63	16.06	24.63	9.34
Summary data were based on imputed data for ambient PM2.5 and ambient BC.