Results of Tenotomy of the Tendo Achillis in Intermittent Claudication

significantly affected by this selection. Indeed, for some factors, notably sex, it is a better selection of the 223 cases than the original selection of 177 measured cord lengths. However, there seems to be a deficiency of mothers over the age of 35 years, and of children born before 38 weeks of pregnancy. From Table IlI it can be seen that the duration of the third stage of labour does not significantly affect the length of the cord. Two of the sums of squares were significantly small. This is reasonable, since two other sums of squares were quite large, though not significantly so. A linear regression was performed of cord length on each factor in turn, and none of the factors was found to be significant. Sex seemed to affect the cord length most, male children having slightly longer cords.