Table 1.

Spatiotemporal model specifications for ozone in the six MESA regions.

								2Spatial Smoothing
City	Buffer (km)	No. of AQS Sites	No. of Fixed Sites	No. of Home Sites	No. of Predictor Variables	No. of Time Trends	1No. of PLS Scores	Long Term (β0)	Time Trend (βi)
3LA+RS	75	44	7	117	184	2	(3,2,2)	Yes	No
New York	75	27	2	90	222	2	(1,2,1)	Yes	No
Chicago	100	30	5	80	181	1	(2,1)	No	No
Baltimore	100	41	4	60	202	2	(2,2,1)	Yes	No
4W-S	200	48	4	100	204	2	(1,2,1)	Yes	No
St Paul	200	14	4	96	192	1	(1,1)	No	No

¹Number of PLS scores for (long-term mean, 1^st time trend, 2^nd time trend);

²Yes, exponential covariance structure. No, independent covariance structure

³Los Angeles and Riverside

⁴Winston-Salem