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Table 3 Data sampled from couples on readiness for twins before beginning fertility treatment, stratified by age.

From: Pre-treatment preferences and characteristics among patients seeking in vitro fertilisation

  Twins would be a very undesirable outcome I would be a little worried about having twins It is irrelevant & I don't care about twins I'm only mildly interested in twins I would be very excited - twins would be highly desirable TOTAL
Age (yrs)       
Wife       
<30   1
(4.5)
3
(13.6)
3
(13.6)
15
(68.2)
22
(10.7)
30-34 1
(1.6)
7
(11.3)
11
(17.7)
7
(11.3)
36
(58.1)
62
(30.1)
35-39 1
(1.3)
17
(21.8)
9
(11.5)
9
(11.5)
42
(53.8)
78
(37.9)
≥40   5
(11.4)
5
(11.4)
4
(9.1)
30
(68.2)
44
(21.4)
TOTAL 2
(1.0)
30
(14.6)
28
(13.6)
23
(11.2)
123
(59.7)
206
Husband       
<30    3
(33.3)
  6
(67.3)
9
(4.5)
30-34 1
(1.8)
3
(5.3)
16
(28.1)
5
(8.8)
32
(56.1)
57
(28.4)
35-39 2
(2.6)
13
(17.1)
11
(14.5)
9
(11.8)
41
(53.9)
76 (37.8)
40-44 1
(2.6)
5
(13.2)
9
(23.7)
1
(2.6)
22
(57.9)
38
(18.9)
≥ 45   2
(9.5)
5
(23.8)
2
(9.5)
12
(57.1)
21
(10.4)
TOTAL 4
(2.0)
23
(11.4)
44
(21.9)
17
(8.5)
113
(56.2)
201
  1. Note: Neither maternal age (p = 0.718) nor paternal age (p = 0.656) was associated with anxiety about twins in an upcoming fertility treatment cycle.