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. Author manuscript; available in PMC: 2017 Jul 1.
Published in final edited form as: Environ Res. 2016 Mar 31;148:102–111. doi: 10.1016/j.envres.2016.03.036

Table 3.

OR and 95% CI for the association between NO2 and childhood acute leukemia.

All Leukemia Acute Lymphoid
Leukemia		 Acute Myeloid
Leukemia
Cases
N		 Controls
N		 Unadjusted
OR (95%
CI)		 Adjusted
for
Maternal
Education
OR (95%
CI)		 Unadjusted
OR (95%
CI)		 Adjusted
for
Maternal
Education
OR (95%
CI)		 Unadjusted
OR (95%
CI)		 Adjusted
for
Maternal
Education
OR (95%
CI)
Quartiles
of NO2
1.00–7.04
ppb		 80 252 Referent Referent Referent Referent Referent Referent
7.05–8.82
ppb		 73 251 0.94 (0.65,
1.34)		 0.88
(0.61,
1.27)		 0.88 (0.58,
1.32)		 0.85
(0.56,
1.29)		 1.16 (0.55,
2.45)		 1.17
(0.54,
2.56)
8.83–11.18
ppb		 64 256 0.79 (0.54,
1.14)		 0.75
(0.52,
1.09)		 0.66 (0.42,
1.02)		 0.65
(0.42,
1.01)		 1.24 (0.61,
2.53)		 1.28
(0.60,
2.71)
11.19–
19.89 ppb		 90 254 1.11 (0.78,
1.58)		 1.08
(0.75,
1.55)		 1.15 (0.77,
1.71)		 1.09
(0.72,
1.64)		 1.04 (0.50,
2.20)		 1.28
(0.59,
2.80)
Cutpoints
at 10th and
95th
percentiles
1.00–5.19
ppb		 23 101 Referent Referent Referent Referent Referent Referent
5.20–14.32
ppb		 274 860 1.34 (0.83,
2.17)		 1.30
(0.81,
2.10)		 1.19 (0.71,
2.00)		 1.15
(0.68,
1.93)		 2.36 (0.67,
8.29)		 2.64
(0.74,
9.43)
14.33-
19.89 ppb		 10 52 0.80 (0.35,
1.84)		 0.79
(0.34,
1.84)		 0.76 (0.29,
2.00)		 0.74
(0.28,
1.98)		 1.24 (0.21,
7.23)		 1.62
(0.27,
9.74)

OR=odds ratio, CI=confidence interval