Table 2.

Results of the propensity score-matched analysis estimating the average effect on state anxiety (STAI-S) in the individuals exposed (ATT). Significant results are indicated by *.

Condition	Best Covariate Balance	Matched (n)	Unmatched (n)	ATT	95% CI	p Value
Exposed to an above-the-average MT air concentration	Std. Mean Difference < 0.1	Controls = 268 Cases = 237	Controls = 0 Cases = 0	−1.28	−2.51 to −0.06	0.04 *
Exposed to an above-the-average α-pinene air concentration	Std. Mean Difference < 0.1	Controls = 296 Cases = 209	Controls = 0 Cases = 0	−1.31	−2.15 to −0.12	0.03 *
Exposed to an above-the-3rd quartile MT air concentration	Std. Mean Difference < 0.12	Controls = 356 Cases = 149	Controls = 0 Cases = 0	−1.61	−2.84 to −0.4	0.01 *
Exposed to an above-the-3rd quartile α-pinene air concentration	Std. Mean Difference < 0.1	Controls = 345 Cases = 160	Controls = 0 Cases = 0	−1.68	−3.2 to −0.16	0.03 *