The percentage of women experiencing an unintended pregnancy during the first year of typical use and the first year of perfect use of contraception and the percentage continuing use at the end of the first year in the United States:

 

Pregnancy incidence during different kind of contraceptives.

% of Women Experiencing an Accidental Pregnancy within the First Year of Use % of Women Continuing Use at One Year 3
Method Typical Use  Perfect Use

(4)
Chance 85 85  
Spermicides 26 6 40
Periodic abstinence 25   63
  Calendar   9  
  Ovulation method   3  
  Sympto-thermal   2  
Post-ovulation   1  
Withdrawal 19 4  
Cap      
  Parous women 40 26 42
  Nulliparous women 20 9 56
Sponge      
  Parous women 40 20 42
  Nulliparous women 20 9 56
Diaphragm 20 6 56
Condom      
  Female (Reality) 21 5 56
  Male 14 3 61
Pill 5   71
  progestin only   0.5  
  combined   0.1  
IUD:      
  Progesterone T: 2.0 1.5 81
  Copper T 380A 0.8 0.6 78
  LNg 20 (Mirena) 0.1 0.1 81
Depo Provera 0.3 0.3 70
Norplant and Norplant-2 0.05 0.05 88
Female sterilization 0.5 0.5 100
Male sterilization 0.15 0.10 100