-Pregnancy rates by year, area, and month of 

 for tests of pregnancy rates between area 



collection, and chi-square values 

 s in 1958, 1960-62. and 1964 



[San^ple sizes are shown in parentheses] 



Age Calif. 



S. E. Gulf of Western 



Wash Alaska Alaska Alaska 



Unimak Bering 



Pass Sea 



Chi- 

 square 



1958 

 June 



87.8 

 (49) 



1960 

 June 



\ 



June- 

 Aug. 



92. 1 90.8 



(51) (412) 



96.7 

 (91) 



92. 9 

 (183) 



78.4 82.2 



(74) (169) 



82. 1 

 (28) 



69. 1 

 (55) 



77. 5 

 (178) 



Apr. . 

 May 



18. 5 

 (27) 



65.2 

 (23) 



84.9 

 (73) 



65.2 

 (69) 



49 



