Vol. 8, 1922 
STATISTICS: R. PEARL 
77 
TABLE 1 
Frequency Distribution for Variation in the Vital Index in the Four 
Quarters of the Year 
VITAI. INDEX 
QUARTERS Ending 
MARCH 31 
JUNE 30 
SEPT. 30 
DEC. 31 
65- 69 




70- 74 




75- 79 
1 

_ 

80- 84 



85- 89 




90- 94 




9.5- 99 


. 

100-104 


1 

105-109 
1 


110-114 



115-119 
3 

_ 

120-124 
3 


1 
125-129 
1 


1 
130-134 
3 
2 

4 
135-139 
9 
3 
3 
4 
140-144 
11 
2 
7 
145-149 
13 
2 
3 
5 
150-154 
9 
7 
5 
9 
155-159 
13 
6 
5 
11 
160-164 
10 
5 
10 
9 
165-169 
2 
11 
9 
17 
170-174 
3 
9 
8 
7 
IV^— 17Q 
11 
8 
4 
180-184 
9 
6 
2 
185-189 
10 
3 
190-194 
2 
4 
195-199 
1 
1 
8 
1 
200-204 
2 
1 
205-209 
1 
3 
210-214 
1 
215-219 
4 
245-249 
1 
Total 
83 
83 
83 
83 
table 2 
Biometric Constants Deduced from Table 1 
QUARTER ENDING 
MEAN 
STANDARD DEVIATION 
March 31 
147.06 ± 
1 
.21 
16 
32 =t 
.85 
June 30 
169.89 =i= 
1 
.21 
16 
35 =t 
.86 
September 30 
175.43 ± 
1 
.66 
22 
39 =i= 1 
.17 
December 31 
156 .46 =±= 
1 
.27 
17 
14 =t= 
.90 
the series, but it has not been thought best to discard or adjust them in this 
first treatment of the subject. Consequently it is to be understood that all 
the values given in table 1 were used in computing the values in table 2. 
