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fage - Father's age in years.
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mage - Mother's age in years.
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mature - Maturity status of mother.
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weeks - Length of pregnancy in weeks.
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premie - Whether the birth was classified as premature (premie) or full-term.
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visits - Number of hospital visits during pregnancy.
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gained - Weight gained by mother during pregnancy in pounds.
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weight - Weight of the baby at birth in pounds.
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lowbirthweight - Whether baby was classified as low birthweight (low) or not (not low).
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gender - Gender of the baby, female or male.
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habit - Status of the mother as a nonsmoker or a smoker.
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marital - Whether mother is married or not married at birth.
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whitemom - Whether mom is white or not white.