http://www.fda.gov/forconsumers/ ... ities/ucm126372.htm
Manufacturers "spot check" their condoms using a "water-leak" test. FDA inspectors do a similar test on sample condoms they take from warehouses. The condoms are filled with water and checked for leaks. An average of 996 of 1000 condoms must pass this test.
連明知美國會check的"好貨"都是4 out of 1000連水都過到, 來香港都無政府check的貸1000個有10幾20十幾連水都過到好合理. 所以1%-2%有condom如同無條數是合理的. FDA是信得過, 就算來香港的貨同美國真是一樣QA, 0.4%過水都幾恐怖. 0.4%過水應該如同最少1%-2%過AIDs. 那麼估計來香港的貸過到AIDs應該最少是4%或以上.....
http://goaskalice.columbia.edu/explanation-condom-failure-rates
columbia U是超勁U, stats唔是玩
perfect condom use: 2 and 3 out of 100 sexually active women becoming pregnant (也就是可能中aids)
During a year of typical condom use, between 10 and 15 out of 100 sexually active women will become pregnant.