26 



Eeva Jalavisto 



that in the group under 2 years old. Furthermore, if a group 

 is formed containing the cases of 2-19 years it differs from the 

 20-29 years of age group only slightly, the probability for 

 random occurrence being 0-05 > P > 0-02. Since the age 

 group 20-29 is small, the age group 2-29 years may be used 

 as the basis of reference. 



35- 



30 



25 



20 



C 15 



« 



a 

 10 



X Dead during first year of life 



• ■• •• second 



O ., „ 3rd & 4th 



D •• between ages 2-29 years 

 ^ 20-29 '• 



i2U 



25-29 



25-29 30-34 235 



30-34 235 i2L 



Maternal age, years 



Fig. 4. Distribution in various maternal age groups of deaths 



of children under 30 years of age. Total series, 5,590 cases ; 



2,735 were born before 1800. 



It may be asked whether the difference found is a real one, 

 or could be due to differences in recording, i.e. due to the fact 

 that in the latter part of the 19th century the number of 

 recorded infant deaths is relatively greater than in earlier 

 years. In order to exclude this fallacy, the same comparison 

 has been made with cases born before the year 1800. The 

 result is exactly the same except that the number of cases in 

 the 20-29-year group is rather small and gives a somewhat 

 abnormal distribution of deaths. The 2-29-year group is 



