Table 4 Discontinuations, Conceptions, and Conceptions Leading to Live Births up to 24 Months After Beginning Natural Procreative Technology Treatment, by Characteristics of Couples Beginning Treatment

All couples

370

209 (56)

116 (31)

66 (18)

39

29

Age, y

0.0216^a

0.0438^a

 <35

184

91 (49)

64 (35)

40 (22)

44

34

 ≥35

186

118(63)

52 (28)

26 (14)

33

23

Time trying for birth, y

<0.001^a

<0.001^a

 <1

97

45 (46)

40 (41)

24 (25)

52

38

 1-2.9

165

90 (55)

58 (35)

33 (20)

42

33

 ≥3

108

74 (69)

18 (17)

9 (8)

15

12

Had prior pregnancy

0.0129^a

0.1299^a

 Yes

169

92(54)

66(39)

35 (21)

52

36

 No

201

117 (58)

50 (25)

31 (15)

29

25

Had prior live birth

0.1040^a

0.6249^a

 Yes

99

58 (59)

34 (34)

18 (18)

54

35

 No

269

150 (56)

82 (30)

48 (18)

34

28

Received prior IVF

0.1861^b

0.7490^a

 Yes

21

16 (76)

4 (19)

2 (10)

30

20

 No

348

192 (55)

112 (32)

64 (18)

40

30

Received prior IUI

0.2305^a

0.1836^a

 Yes

49

33 (67)

11 (22)

5 (10)

21

15

 No

320

175 (55)

105 (33)

61 (19)

41

32

Physician

0.7869^a

0.7506^a

 Dr. Carpentier

316

179 (57)

98 (31)

56 (18)

39

30

 Dr. Rollo

54

30 (56)

18 (33)

10 (19)

40

27

Menstrual/fertility cycle charting

0.7551^a

0.5753^a

 Creighton Model

297

167 (56)

92 (31)

53 (18)

38

30

 Other

51

25 (49)

18 (35)

12 (24)

42

30

None/missing

22

17 (77)

6 (27)

1 (2)

49

10

BMI

0.0812^b

0.0008^b

 <25

154

83 (54)

54 (35)

38 (25)

45

40

 ≥25

121

65 (54)

34 (28)

12 (10)

31

16

Start date (tertiles)

0.0850^a

0.8055^a

 Dec 1990-June 2005

113

72 (64)

30 (27)

17 (15)

33

25

 June 2005-Mar 2010

130

58 (45)

44 (34)

31 (24)

42

34

 Mar 2010- Dec 2013

126

79 (63)

41 (33)

18 (14)

38

28