Differences in fertility associated with caffeinated beverage consumption.

Objectives. The effect of caffeine consumption on fertility was examined prospectively in 210 women. Methods. Women reported on caffeinated beverage consumption and pregnancy status monthly. Odds ratios for becoming pregnant were calculated for both high and moderate vs low consumption. Results. No significant association was found for any of the caffeinated beverages except tea. Drinking one-half cup or more of tea daily approximately doubled the odds of conception per cycle. Conclusions. These data suggest that caffeine may not be the responsible agent for variation in fertility associated with consumption of the beverages examined. [ABSTRACT FROM AUTHOR]