1. Multifetal pregnancy in older women and perinatal outcomes
Jun Zhang, M.D., Ph.D., Susan Meikle, M.D., David A Grainger, M.D., Ann Trumble, Ph.D. 
Fertility and Sterility 
Volume 78, Issue 3, Pages (September 2002)
DOI: /S (02)

2. FIGURE 1
Race-and-parity-adjusted perinatal mortality rate (PMR) and infant mortality rate (IMR) by maternal age in singleton, twin, and triplet pregnancies in the United States, 1995–1997.
Zhang. Multifetal pregnancy in older women. Fertil Steril 2002.
Fertility and Sterility  , DOI: ( /S (02) )

3. FIGURE 2
Adjusted relative risks and 95% confidence intervals of very preterm birth (upper panel), very low birthweight (upper panel), perinatal (lower panel), and infant deaths (lower panel) by maternal age, using women of 25–29 years in corresponding group as the comparison.
Zhang. Multifetal pregnancy in older women. Fertil Steril 2002.
Fertility and Sterility  , DOI: ( /S (02) )