Subject characteristics | Number of subjects | Mean birth weight (g) | Standard deviation in birth weight (g) | % of infants with a low birth weight (<2,500Â g) |
---|---|---|---|---|
Infant’s gender |  |  |  |  |
 Female | 36,133 | 3,408.2 | 459.7 | 2.09 |
 Male | 38,283 | 3,527.5 | 473.5 | 1.35 |
Race/ethnicity of mothers | Â | Â | Â | Â |
 AfricanAm | 6,261 | 3,329.7 | 475.2 | 3.19 |
 Asian | 7,358 | 3,314.7 | 444.2 | 2.57 |
 Hispanic | 23,678 | 3,469.0 | 461.7 | 1.59 |
 Caucasian | 30,548 | 3,542.4 | 464.4 | 1.23 |
 Mixed | 322 | 3,473.2 | 458.2 | 0.93 |
 Other | 3,095 | 3,413.4 | 483.2 | 2.23 |
 Missing | 3,154 | 3,462.3 | 479.8 | 1.84 |
Insurance status of mothers | Â | Â | Â | Â |
 Private | 50,880 | 3,490.7 | 468.1 | 1.53 |
 Public | 20,525 | 3,418.5 | 475.9 | 2.2 |
 Missing | 3,011 | 3,460.2 | 450.3 | 1.3 |
Chronic hypertension in mothers | Â | Â | Â | Â |
 No | 74,138 | 3,469.8 | 470.3 | 1.7 |
 Yes | 278 | 3,395.9 | 551.7 | 3.96 |
Heart diseases in mothers | Â | Â | Â | Â |
 No | 74,333 | 3,469.7 | 470.6 | 1.7 |
 Yes | 83 | 3,309.7 | 511.1 | 6.02 |
Preeclampsia in mothers | Â | Â | Â | Â |
 No | 72,760 | 3,473.0 | 467.6 | 1.58 |
 Yes | 1656 | 3,319.4 | 570.2 | 7.37 |
Diabetes in mothers | Â | Â | Â | Â |
 No | 70,622 | 3,463.5 | 465.6 | 1.73 |
 Yes | 3794 | 3,582.5 | 544.6 | 1.34 |
Maternal weight gain during pregnancy | Â | Â | Â | Â |
 Low (<15 lbs) | 1286 | 3,376.1 | 491.1 | 3.34 |
 Medium | 57,727 | 3,445.9 | 463.2 | 1.79 |
 High (>30 lbs) | 15,397 | 3,566.1 | 483.5 | 1.24 |
 Missing | 6 | 2,978.8 | 686.4 | 0.08 |
 Parity |  |  |  |  |
 First delivery | 60,382 | 3,458.3 | 471.4 | 1.81 |
 At least second delivery | 14,034 | 3,518.0 | 464.4 | 1.26 |