Epidemiology of endometriosis.

Oral contraceptive use Never users 1-00 1-00 1-00 1-00 (n= 67) (n= 25) (n= 131) Currentusers 2-3 (0-1 to2 l) 2 7 (0O9to7 8) 0 7 (0-2to 1 8) 0-8 (0 3 to 1.6) (n=) (n= 6) (n= 7) Formerusers 2 2 (1 3 to 3 7) 2 7 (1 4 to 5 2) 1 5 (1 0 to 2 3) 1 9 (1 4 to 2 6) (n = 53) (n = 21) (n = 63) Duration ofuse (years): <3 21 (1 2to32) 24(12 to 50) 1l6(1.0 to 25) 19(13 to 27) (n = 37) (n = 18) (n = 49) 33 15(07 to 31) 32(13 to 77) 1.1(06 to 19) 14(0-9to22) (n = 12) (n= 9) (n = 21) Time since last use (years): < 10 2-4 (1 4 to 4O0) 31(1 6 to 6 2) 1l5 (I 0 to 2-4) 20 (1-4 to 2 9) (n = 46) (n = 18) (n = 42) 10 13 (04to40) 07 (01 to50) 16 (09to30) 15 (09to27) (n =7) (n =i) (n= 21) Time since first use (years): <15 19(12to32) 28(15to53) 14(09to21) 17(13to24) (n= 50) (n= 24) (n= 53) 3 15 1 4 (0 3 to 5'7) 1 3 (072 to 10 0) 1-4 (0 7 to 3-0) 1 4 (0 7 to 2 8) (n= 4) (n = 1) (n= 13)