. 2021 Sep 29;10:e69298. doi: 10.7554/eLife.69298

Table 1. Between- or within-group variations in birthweight and gestational exposure to fire-sourced PM_2.5 and their correlations.

	Standard deviation (% of total variance)		Correlation (R)
	Birthweight(g)	Fire-sourced PM_2.5 g/m³	Correlation (R)
Total	724 (100%)	5.53 (100%)	0.1594
Between groups of matched siblings	613 (71.7%)	5.30 (91.7%)	0.1973
Within groups of matched siblings	386 (28.3%)	1.59 (8.3%)	−0.0035

Table 1. Between- or within-group variations in birthweight and gestational exposure to fire-sourced PM2.5 and their correlations.