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Pelvimetry by Colcher-Sussman method was performed in 30 primigravida at Eul Jj Hospital during the period of February 1977 to September 1980. They were divided by mode of delivery retrospectively into 2 groups…:…A group was 99 cases who had vaginal delivery, and B group was 31 cases who have been delivered by cesarean section. The comparison was made between 2 groups by ANOVA test, X^2-test or Fisher’s extact test. The results were as followings. Ⅰ. The measurements of X-ray pelvimetry for 2 groups. (cm) A group B group 1. Pelvic inlet A-P diameter; 12.80±0.95 12.07±0.95 Transverse diameter; 13.14±0.66 12.58±0.69 Mean diameter; 12.97±0.55 12.33±0.62 2. Mid-pelvis A-P diameter; 12.29±0.86 11.62±0.88 Transverse diameter; 10.18±0.74 9.75±0.76 Mean diameter; 11.23±0.55 10.69±0.57 3. Pelvic outlet A-P diameter; 7.76±1.07 7.68±1.18 Transverse diameter; 10.19±0.79 9.43±0.80 Mean diameter; 8.94±0.73 8.60±0.68 4. Fetal head Average diameter; 10.43±0.38 10.64±0.40 All the measurements described above except for the A-P diameter of the pelvic outlet were significant between 2 groups by ANOVA test(p<0.05) Ⅱ. The comparison of other fetal and maternal factors between 2 groups. 1. Engagement of fetal head. Absence of engagement of fetal head were 5.1% in A group, and 25.8% in B group. The significance was noted between 2 groups by the X^2-test(p<0.05). 2. Type of coccyx. Slightly anteriorly deviated coccyx were 20.2% in A group, and 29.0% in B group. There was not a single case in A group with markedly deviated coccyx, and it was significant when compared the 2 groups by the Fischer’s exact test (p<0.05). 3. Type of sacrum. Flat sacrum was not seen in A group, but 12.9% in B group, and there was significance between 2 groups by the Fischer’s exact test (p<0.05). 4. Position of fetal spine, sex of fetus, presentation of the fetal head, and body weight of fetus were not significant between 2 groups by X^2-test.
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