Table 3.

Distribution of the daily mean levels of ambient particulate matter ≤10 µm in aerodynamic diameter (PM₁₀), within 1  day to 14 days before recruitment'.

Days before recruitment	Mean (µg/m3)	SD	Quartiles (µg/m3)
			1th	2nd	3th	4th
1 day	49.1	32.6	≤24	25–39	40–69	>154
2 days	48.0	31.6	≤26	27–42	43–64	>163
3 days	51.3	33.2	≤28	29–45	46–67	>174
4 days	54.8	34.3	≤28	29–48	49–70	>174
5 days	53.9	30.2	≤31	32–47	48–68	>145
6 days	53.3	29.1	≤33	34–46	47–70	>157
7 days	54.1	33.2	≤30	31–45	46–67	>174
8 days	51.5	33.6	≤27	28–42	43–68	>159
9 days	48.6	31.1	≤26	27–40	41–66	>157
10 days	49.9	32.6	≤27	28–42	43–64	>174
11 days	53.4	29.7	≤31	32–51	52–70	>157
12 days	54.6	30.5	≤32	33–48	49–70	>164
13 days	54.8	30.7	≤31	32–45	46–71	>157
14 days	52.4	34.6	≤26	27–40	41–72	>157

Values in table are mean, standard deviation (SD) and 1th to 4th quartiles of daily means levels of the individual values attributed to each study subject.