Table 1 -.
Summary Statistics
| Variable | Mean | Std. Dev. | Min | Max |
|---|---|---|---|---|
| Average Infants’ Characteristics: | ||||
| Birth Weight (in grams) | 3292.851 | 318.895 | 227 | 7777 |
| Low Birth Weight | .07 | .136 | 0 | 1 |
| Very Low Birth Weight | .012 | .058 | 0 | 1 |
| Full-Term Birth Weight (grams) | 3376.137 | 271.733 | 804 | 7777 |
| Foetal Growth (grams/week) | 84.829 | 7.395 | 9.08 | 210.189 |
| Gestational Age (weeks) | 38.792 | 1.381 | 17 | 47 |
| Very Premature Birth | .007 | .043 | 0 | 1 |
| Birth Counts | 45.952 | 152.467 | 1.007 | 8120.813 |
| Average Parental Characteristics: | ||||
| Age of Mother (years) | 26.127 | 3.348 | 11 | 51 |
| Mother Race: Black | .238 | .398 | 0 | 1 |
| Mother Hispanic | .027 | .096 | 0 | 1 |
| Mother Race: Other | .104 | .272 | 0 | 1 |
| Father Race: White | .574 | .402 | 0 | 1 |
| Father Race: Black | .132 | .253 | 0 | 1 |
| Father Hispanic | .023 | .083 | 0 | 1 |
| Mother’s Education Missing | .048 | .199 | 0 | 1 |
| Mother’s Education< High School | .024 | .085 | 0 | 1 |
| Mother’s Education=High School | .502 | .296 | 0 | 1 |
| Mother’s Education Some College | .242 | .232 | 0 | 1 |
| Mother’s Education Bachelor | .116 | .169 | 0 | 1 |
| Mother’s Education Master-PHD | .068 | .129 | 0 | 1 |
| Mother Cigar/Tobacco Smoker | .143 | .204 | 0 | 1 |
| Any Prenatal Visits | .964 | .106 | 0 | 1 |
| Father’s Age <30 years | .207 | .214 | 0 | 1 |
| Exposure Measures: | ||||
| PM10 (μg/m3) | 22.931 | 7.995 | −100.547 | 174.626 |
| Standardized PM10 | 0 | 1 | −15.444 | 18.973 |
| Ozone (μg/m3) | 28.55 | 6.996 | −116.617 | 137.543 |
| Standardised Ozone | 0 | 1 | −20.75 | 15.579 |
| Precipitation (inch) | 6.445 | 6.226 | −148.467 | 468.571 |
| Standardised Precipitation | 0 | 1 | −24.88 | 74.221 |
| Observations | 535,036 | |||
| No. of Pre-Collapse Observations | 69,936,360 | |||