The dear doctor! I heard, that, according to statistics, reliability even sa...

[Belief]

The dear doctor! I heard, that, according to statistics, reliability even the most good About. does not exceed 98 %. In what these missing 2 % consist? In their biochemical imperfection if so it is possible it will be expressed, or the human factor (for example, the woman has forgotten to accept a preparation, has mixed a dose, otherwise, operated or worked not under the instruction) here takes place?

[Soboleva L.I.]

Dear Belief! 2 3 % beremennostej, arisen on a background of reception OK are connected with wrong reception or action of the factors weakening or easying contraceptive effect.