J Clin Med Res

Journal of Clinical Medicine Research, ISSN 1918-3003 print, 1918-3011 online, Open Access

Article copyright, the authors; Journal compilation copyright, J Clin Med Res and Elmer Press Inc

Journal website http://www.jocmr.org

Original Article

Volume 7, Number 7, July 2015, pages 551-555

The Association of Air Pollution With the Patients’ Visits to the Department of Respiratory Diseases

Figures

Figure 1. The generalized additive models formula.

Figure 2. The age distribution of department of respiration patients. Blue: male; red: female.

Figure 3. Non-linear effect chart between the sum of PM2.5 within 2 days (PM2.5td) in Jinan and the quantity of patients in the outpatient department of respiratory diseases (ODRD).

Tables

**Table 1.** Concentration of Air Pollutants in Jinan City and the Minimum Temperature of the Descriptive Analysis During the Study Period
	Min	Max	Median	Four quartile range
T_min (°C)	-10.00	29.00	14.00	18.00
PM2.5 (μg/m³)	21.00	444.00	81.00	52.75
PM2.5td (μg/m³)	60.00	773.00	163.00	101.50
CO (mg/m³)	0.38	4.19	1.12	0.69
NO₂ (μg/m³)	13.00	134.00	52.50	28.00
SO₂ (μg/m³)	17.00	228.00	58.50	63.75

**Table 2.** Regression Analysis of the Estimated Values of Model Parameters
Variables	Estimated values	SEM	t value	P value
Intercept	3.5811	0.0484	73.96	< 0.0001
Factor 1	0.0265	0.0084	3.16	0.0017
Week	0.0030	0.0002	17.32	< 0.0001
Linear (T_min)	-0.0109	0.0007	-15.38	< 0.0001
Linear (PMtd)	0.0011	0.0001	14.49	< 0.0001

**Table 3.** Quantitative Analysis of Smooth Components in Non-Parameter Models
Smooth components	Smooth parameter	Degree of freedom	Generalized cross-validation (GCV)	No. of variables at different values
Spline (T_min)	0.9982	4.2724	0.0497	40
Spline (PMtd)	0.9999	4.2320	0.0551	193

**Table 4.** Analysis of Variance of the Non-Parameter Model
Smooth components	Degree of freedom	Sum of square	χ² value	P value
Spline (T_min)	4.2724	312.93	48.57	< 0.0001
Spline (PMtd)	4.2320	99.69	15.47	0.0047