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Table 1 Characteristics of the Study Population, by California County, 1995-2009 (N = 14,466)

From: The impact of high apparent temperature on spontaneous preterm delivery: a case-crossover study

County Na Maternal Age (years), % Maternal Race/Ethnicity, % Infant Sex,%
18-19 20-24 25-34 >35 White Black Hispanic Asian Otherb Male
Alameda 2,362 5 17 55 24 27 14 22 26 12 54
Buttec 24 21 29 38 13 71 0 13 13 4 58
Contra Costa 1,467 5 16 54 24 45 11 18 16 10 55
El Dorado/Amador 95 5 6 66 22 82 0 7 6 4 60
Madera 39 10 21 41 28 38 5 51 3 3 59
Marin 198 2 13 58 27 60 5 21 10 5 51
Merced 17 6 24 35 35 47 0 29 0 24 59
Monterey 17 0 35 41 24 35 0 47 12 6 59
Napa/Lake 166 6 19 54 20 62 0 33 2 2 58
Nevada/Fresno 476 8 22 53 17 43 7 38 9 3 55
Placer 311 5 18 59 18 70 2 13 11 4 50
Sacramento 2,489 8 21 51 20 49 14 17 17 4 56
San Benito 24 4 8 54 33 50 8 38 0 4 63
San Francisco 800 3 13 54 30 30 12 19 34 6 59
San Joaquin 661 7 17 57 19 31 10 33 14 12 55
San Mateo 878 4 15 55 26 30 2 28 34 6 56
Santa Clara 2,441 4 16 57 23 35 3 29 24 9 54
Santa Cruz 18 6 17 33 44 72 0 6 0 22 61
Solano 1,018 8 23 50 19 40 19 16 20 5 54
Sonoma/Mendocino 566 6 17 56 20 67 1 23 6 2 57
Stanislaus 211 3 19 62 16 33 3 30 6 28 48
Sutter 13 8 15 54 23 46 15 23 8 8 62
Tulare/King 17 6 41 35 18 24 0 65 0 12 59
Yolo 158 6 20 56 18 53 3 27 16 1 51
Total 14,466 6 18 54 22 40 9 23 20 8 55
  1. aN: number of preterm births;
  2. bOther: American Indian, other/unknown race
  3. c5 Combined counties includes: Butte, Lassen, Shasta, Tehama, Yuba