Table 2. Characteristics of the study subjects in Group 1 (2017, 2018 and 2020) and 2 (2019 and 2021).
Characteristics Group 1
(n=678)
Group 2
(n=431)
p-value
Age (Years)
<25
>25
Mean (±SD)

32 (4.7)
646 (95.3)
34.6±7.0

11 (2.6)
420 (97.4)
34.6±6.2
0.07
Body Mass Index (kg/m2) (n=1,064)
<18.5
18.5-24.9
25-29.9
>30
Mean (± SD)

16 (2.5)
334 (51.8)
230 (35.7)
65 (10.1)
25.0±3.

7 (1.7)
205 (48.9)
158 (37.7)
49 (11.7)
25.5±4.1
0.55
Underlying disease (n=995)
No
Yes

484 (85.7)
81 (14.3)

370 (86.0)
60 (14.0)
0.86
Smoking status (n=1,108)
Non-smoker
Smoker

549 (81.1)
128 (18.9)

342 (79.4)
89 (20.6)
0.48
Infertility factor of couples (n=979)
Male factor infertility
Tubal factor
Ovulation factor
Endometriosis
Unexplained
Other

248 (41.8)
50 (8.4)
60 (10.1)
58 (9.8)
137 (23.1)
41 (6.9)

138 (35.8)
38 (9.9)
50 (13.0)
28 (7.3)
108 (28.1)
23 (6.0)
0.13