Sixty-two vinyl polysiloxane casts from subjects in the lying, supine position were measured for surface area with five shapes: conical, parallel sides, heart, slug, and pumpkin seed being included. The surface areas ranged from 65.73 to 107.07 cm² with a mean of 87.46 cm² and a standard deviation of 7.80 cm². There were no significant differences in surface area among the shape groups. And no correlations with surface area were found by parity or by rod length, introital diameter, posterior length of casts as measured with string, or greatest width and greatest depth of casts. 70% of the casts had a surface area of 84.50 cm² or above, and 90% had a surface area of 77.72 cm² or above. Variation within the interquartile range (75th to 25th percentile) was ±5.2% of the median.

Full vaginal casts of 39 Caucasian women, 13 each nulliparous, uniparous and multiparous, were made using vinyl polysiloxane impression material. Vaginal lengths were measured with polished acrylic rods inserted by the subjects, and introital diameters were measured with conical polypropylene flasks. Parallel sided, conical, heart, and slug shapes were found. Lengths ranged from 6.86 to 14.81 cm; widths ranged from 4.8 to 6.3 cm; introital diameters ranged from 2.39 to 6.45 cm. No significant differences by parity or shape were found.

Full vinyl polysiloxane casts of the vagina were obtained from 23 Afro-American, 39 Caucasian and 15 Hispanic women in lying, sitting and standing positions. A new shape, the pumpkin seed, was found in 40% of Afro-American women, but not in Caucasians or Hispanics. Analyses of cast and introital measurements revealed: (1) posterior cast length is significantly longer, anterior cast length is significantly shorter and cast width is significantly larger in Hispanics than in the other two groups and (2) the Caucasian introitus is significantly greater than that of the Afro-American subject.

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