Table 6. Sensitivity analyses for two different spline models^a.

	Quadratic spline	Cubic nature spline
Warm season	0.151 (−0.194, 0.495)	0.153 (−0.191, 0.498)
Cool season	0.251 (0.190, 0.311)	0.242 (0.203, 0.281)
Entire period	0.196 (0.078, 0.315)	0.194 (0.076, 0.311)

^aCurrent day temperature and humidity (lag 0) and 2-day moving average of PM₁₀ (lag 1) are used, 3 df for temperature and humidity is applied.