Table 2. Outcomes comparing the high and low odour score groups^a in 2008, 2010 and 2012, and within the odour score groups^a from 2008 to 2012.

		2008	2010	2012	2012 vs 2008			p for interaction
					MDb (95% CI)	SMDc	p
Total SHC scored
	High odour scorea	13.54	12.37	12.32	−1.35 (−2.52, −0.18)	−2.26	0.02	0.16
	Low odour scorea	9.52	8.81	8.87	−0.19 (−1.32, 0.94)	−0.32	0.75
MDb (95% CI)		3.70 (2.03, 5.37)	2.83 (1.05, 4.61)	2.54 (0.63, 4.45)
SMDc		4.34	3.12	2.61
p		<0.001	0.002	0.009
Subjective neurological complaints scored
	High odour scorea	3.07	2.51	2.61	−0.42 (−0.77, −0.07)	−2.35	0.02	0.04
	Low odour scorea	1.83	1.89	1.85	0.08 (−0.26, 0.39)	0.48	0.63
MDb (95% CI)		1.02 (0.56, 1.49)	0.53 (0.02, 1.03)	0.52 (−0.02, 1.06)
SMDc		4.29	2.04	1.88
p		<0.001	0.04	0.06
Total IES-R scoree
	High odour scorea	7.52	5.35	3.55	−4.16 (−5.19, −3.14)	−7.99	<0.001	<0.001
	Low odour scorea	2.11	1.38	1.17	−0.81 (−1.79, 0.16)	−1.63	0.10
MDb (95% CI)		4.59 (3.23, 5.95)	2.94 (1.68, 4.20)	1.24 (0.05, 2.44)
SMDc		6.62	4.56	2.04
p		<0.001	<0.001	0.04

^a Odour score computed as the percentage of months each participant had noticed the specific foul odour. The participants were divided by the odour score median (31.25) into the high odour score and the low odour score groups, respectively.

^b Mean difference.

^c Standardized mean difference.

^d Scores from the Subjective Health Complaints Inventory (SHC).

^e Scores from the Impact of Event Scale Revised (IES-R).