254 
Distrihution of Fertility 
TABLE XVI. 
Daratiun of Miirriage a nd Nuuiher of Ojfapring. Women s Age at Marriage 
under '25. Ea'perience of New South Wales Census 1901. 
Number 
of 
Offspring 
Duration 4 to 5 Years 
Duration 5 to 10 Years 
Duration 10 to 15 Years 
Married 
W ri 111 p 1 ^ 
Percentage 
Married 
t V unit. 11 
Percentage 
Married 
VV UlllcXi 
Percentage 
0 
1 
2 
3 
5 
6 
7 
8 
0 
10 
11 
541 
1386 
•2751 
954 
96 
4 
9-47 
24-27 
47-81 
16-70 
1-68 
•07 
1094 
2230 
4811 
5567 
3124 
996 
226 
36 
2 
6-05 
12-33 
26-60 
30-78 
17-27 
5-51 
1^25 
•20 
•01 
757 
1039 
1874 
2931 
3603 
3715 
2542 
1233 
422 
118 
38 
7 
4- 14 
5- 68 
10-25 
16-03 
19- 71 
20- 32 
13-91 
6- 75 
2-31 
•65 
•21 
■04 
Totals 
5712 
100-00 
18086 
100-00 
18279 
100-00 
These percentages have been plotted on Fig. 7, and the fertility curves 
computed. The constants were : 
ge. 
10 to 15 years 
3-6399 
- -5179 
36-6377 
-005562 
2-765345 
18^2893 
4^1229 
4^2086 
1 -9078 
20-2118 
It is worthy of notice that for marriages of an average duration of 4-5 years 
the mean family is 1-77, and that for an average duration of 7-5 years it is 2-63 — 
the difference of 3 years' duration being responsible for -86 child or 288 aimually. 
The difference in mean families for marriages of 7^ and 12^ years' mean duration 
is 1'488 child or '298 annually. It is thus seen that the average annual rate 
of increase is ver}' nearly uniform, viz. about 290 or 300 children per 1000 married 
women. It would thus appear that the initial rate of fertility is maintained 
at all events for 15 years of marriage by women marrying at under 25 years 
of age. Whilst such a rate as that prevails in a community I do not think 
Duraiion of Marria 
F2 
Range 
Mean Family 
Modal Family 
Standard Deviation 
//o 
4 to 
1 
2 
10 
1 
1 
45 
5 years 
-72604 
-11092 
-51477 
-032146 
-873581 
•0683 
•7706 
■8631 
•8521 
■9164 
5 to 10 years 
r6271 
+ ^1283 
7^7554 
■003821 
2^929381 
22^5456 
2 •6348 
2^5932 
r2756 
30^9904 
