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. 1999 May 1;318(7192):1192–1194. doi: 10.1136/bmj.318.7192.1192
Type of multiple birth No of multiple births (rate per 1000 maternities*) Ratio of multiple to singleton births
Twins  9 889 (13.6) 1:73    
Triplets    318 (0.4)  1:2282  
Quadruplets       10 (0.0001) 1:72 563
Total 10 217 (14.0) 1:71