Lowest estimates for contraceptive measures of various types are as follows (figures for pregnancies/100 woman-years of exposure):

pill 0.1

condom 7.5

diaphragm and jelly 7.2

withdrawal 12.0

safe period 14.4

foaming tablets, douching 11.9

According to one estimate, the least popular methods of contraception in Britain are the coil/IUD (used by five per cent of married couples), spermicides (five per cent), rhythm method/safe period (six per cent), and the cap/diaphragm with spermicidal cream or jelly (six per cent).