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vlbw = vlbw.replace({'inout':{'born at Duke':0, 'transported':1},
             'delivery':{'abdominal':0, 'vaginal':1},
             'ivh':{'absent':0, 'present':1, 'possible':1, 'definite':1},
             'sex':{'female':0, 'male':1}})

vlbw = vlbw[[u'birth', u'exit', u'hospstay', u'lowph', u'pltct', 
      u'bwt', u'gest', u'meth', 
      u'toc', u'delivery', u'apg1', u'vent', u'pneumo', u'pda', u'cld', 
      u'ivh']].dropna()