The neonatal death rate in the planned hospital birth group was 0.3 / 1000. (skepticalob.com)
Total fertility rate is an estimate of the average number of births a group of women have over their lifetime. (babycenter.com)
So we have the problem of attrition, lets say you try to correct for this by keeping the women in the study in the water birth group. (birthingnaturally.net)