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. 2018 Jan 18;13(1):e0191409. doi: 10.1371/journal.pone.0191409

Table 4. Adjusted survey weighted multivariate regressions to assess the effect of spirometry temperature in the NHANES III cohort*.

n = 11,087 Spirometry (Indoor) Temperature Mean Annual Ambient Temperature
Coefficient (change in FEV1% predicted)
[95% C.I.]		 Coefficient P value Coefficient (change in FEV1% predicted)
[95% C.I.]		 Coefficient P value
Regression of Spirometry Temperature only -1.80
[-3.66, 0.06]		 0.06 Not Applicable
Regression of Mean Annual Ambient Temperature only Not Applicable -0.71
[-1.30, -0.11]
(n = 11,088)		 0.020
Regression Including Both Temperatures -1.81
[-3.67, 0.05]		 0.06 -0.71
[-1.28, -0.14]		 0.015

*All regressions adjusted for sex (male = 0; female = 1), age (years), and insurance status (private = 0; public = 1).