Table 4.

Live Births per 100 Couples at 24 months of Natural Procreative Technology Treatment by Characteristics of Couples Beginning Treatment

Couple CategoryCouples (n)Live Births (n)Crude ProportionAdjusted Proportion*
All couples107227325.552.8
Woman's age (years)
Time spent attempting to conceive (years)
Previous live birth
Previous ART attempts (n)
  • * Adjusted by life-table analysis, where withdrawal or continuing treatment at the end of study follow-up are censoring events. Adjusted proportions should be interpreted with caution because of small numbers in subgroups.

  • Assisted Reproductive Technology (ART) includes in vitro fertilization (IVF) with or without intracytoplasmic sperm injection (ICSI).