. Author manuscript; available in PMC: 2018 Aug 1.

Published in final edited form as: Int J Hyg Environ Health. 2017 May 22;220(6):990–997. doi: 10.1016/j.ijheh.2017.05.008

Table 4.

Results of final analyses using untransformed data.

Univariate logistic regression analysis
Complaint	WQ	Unit Δ (mg/L)	OR (CI_95% )	p-value	R²
Salty taste	TDS	100	1.89 (1.55, 2.31)	<0.001	0.17
Scent	Iron	1.00	2.89 (1.99, 4.19)	<0.001	0.12
Oily sheen	Iron	1.00	15.0 (7.05, 32.1)	<0.001	0.32
Food staining	Iron	1.00	5.19 (3.23, 8.35)	<0.001	0.22

Youden index threshold analysis
Complaint	WQ	Cutoff (mg/L)	OR (CI_95% )	Sens/Spec	AUC

Salty taste	TDS	172	10.1 (5.60, 18.1)	0.72/0.79	0.80
Scent	Iron	0.11	10.4 (5.76, 18.7)	0.78/0.75	0.78
Oily sheen	Iron	0.14	22.7 (12.1, 42.6)	0.82/0.84	0.87
Food staining	Iron	0.43	21.8 (11.2, 42.6)	0.67/0.92	0.82