Hunault et al reported 2 models for predicting spontaneous pregnancy leading to live births for a subfertile couple. These are based on 3 previous studies. The authors are from Erasmus Medical Center, McMaster University and University Medical Center Utrecht.
Patient selection: woman from 21 to 41 years of age
Models incorporated: Eimers, Collins, Snick
Parameters:
(1) woman's age in years
(2) duration of subfertility in years
(3) type of subfertility
(4) sperm motility in percent
(5) referral status
(6) post-coital test
Parameter |
Finding |
Points |
woman's age |
21 to 25 years |
0 |
|
26 to 31 years |
2 |
|
32 to 35 years |
6 |
|
36 or 37 years |
9 |
|
38 or 39 years |
11 |
|
40 to 41 years |
12 |
duration of subfertility |
1 year |
0 |
|
2 years |
2 |
|
3 or 4 years |
5 |
|
5 or 6 years |
9 |
|
7 or 8 years |
13 |
type of subfertility |
primary |
6 |
|
secondary |
0 |
motility in percent |
>= 60% |
0 |
|
40 to 59% |
2 |
|
20 to 39% |
4 |
|
< 20% |
6 |
referral status |
secondary care |
0 |
|
tertiary care |
4 |
post-coital test |
normal |
0 |
|
abnormal |
14 |
total score =
= SUM(points for all 6 parameters)
Interpretation:
• minimum score: 0
• maximum score: 55
• The higher the score the lower the chances of spontaneous pregnancy.
probability of spontaneous pregnancy =
= (0.0289 * ((score)^2)) - (2.8016 * (score)) + 72.93
Specialty: Obstetrics & Gynecology