There are several published studies demonstrating significant gender differences in susceptibility to noise-induced temporary threshold shifts. Dieroff [Arc. Ohren Nas. Kehlk. 177, 282 (1961)] has noted that women apparently are more resistant to the effects of noise and therefore has advocated that women may be safely assigned to work in noisier environments than may men. Ward [J. Acoust. Soc. Am. 40, 478 (1966)] has noted a frequency by gender interaction and has hypothesized that female observers may have more efficient middle-ear muscles than men providing more protection against low-frequency components of noise but less protection at higher frequencies. There have been several attempts to describe changes in hearing which appear to correlate with the normal or imposed menstrual cycle. The present study applied statistical procedures developed for description of and inferences about time-dependent variables (not used in earlier studies) to an analysis of possible changes in susceptibility to NITTS which correlate with the normal menstrual cycle. The results are discussed in relation to occupational safety and health standards and practical implications of menstrual correlates of changes in auditory perception. [Research supported by NIH.]