Table 1

Demographic and related characteristics of mothers and probands
Race of mother
 Number
 Percent
     Caucasian
 237
 87.5
     African-American
 33
 12.2
     Asian/Pacific Islander
 1
 0.4



Age of mother
 Mean years
     At proband's birth
 25.2
     At time of survey
 43.5



Pregnancy outcome
 Number (1)
 Percent
     Live birth
 701
 87.7
     Spontaneous abortion
 95
 11.9
     Stillbirth
 3
 .4



History of spontaneous abortion
 Number
 Percent
     No
 205
 75.6
     Yes
 66
 24.4



Pregnancy distribution
 Range
 Mean
     All pregnancies
 1 to 12
 2.95
     Live births
 1 to 12
 2.59
     Spontaneous abortions
 1 to 6
 1.42



Partners of mothers
 Number
 Percent
     One partner
 211
 77.9
     Two partners
 48
 17.7
     Three partners
 9
 3.3
     Four partners
 3
 1.1



Offspring by partner of mother
 Number
 Percent
     271 natural fathers of proband
 697
 87.2
     60 fathers of proband's half-siblings
 102
 12.8



Proband gender
 Number
 Percent
     Female
 153
 56.5
     Male
 118
 43.5



Proband lesion level
 Number
 Percent
     Thoracic
 110
 40.6
     Lumbar
 135
 49.8
     Sacral
 21
 7.7
     Missing
 5
 1.8

Note: (1) One mother had a history of spontaneous abortion and also had a stillborn child.

Farley Cerebrospinal Fluid Research 2006 3:10   doi:10.1186/1743-8454-3-10