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Table 1 Patient treatment and demographic characteristics according to paternal age

From: Association between paternal age and singleton birthweight in frozen embryo transfer cycles

 

≤ 30 years

n = 2634

31–35 years

n = 3886

36–40 years

n = 2129

≥ 41 years

n = 1116

P value

Maternal age (year)

28.07 ± 2.58

31.66 ± 2.62

34.91 ± 2.93

37.77 ± 3.67

 < 0.001a

Maternal BMI (kg/m2)

21.22 ± 2.60

21.35 ± 2.56

21.66 ± 2.58

21.79 ± 2.48

 < 0.001a

Paternal education

    

 < 0.001b

 Below high school

565 (21.5)

507 (13.0)

345 (16.2)

170 (15.2)

 

 High school

459 (17.4)

440 (11.3)

276 (13.0)

173 (15.5)

 

 College

1553 (59.0)

2570 (66.1)

1281 (60.2)

660 (59.1)

 

 Above college

57 (2.2)

369 (9.5)

227 (10.7)

113 (10.1)

 

Maternal education

    

 < 0.001b

 Below high school

642 (24.4)

628 (16.2)

371 (17.4)

209 (18.7)

 

 High school

427 (16.2)

456 (11.7)

281 (13.2)

160 (14.3)

 

 College

1525 (57.9)

2522 (64.9)

1303 (61.2)

655 (58.7)

 

 Above college

40 (1.5)

280 (7.2)

174 (8.2)

92 (8.2)

 

Infertility cause

    

 < 0.001b

 Female

1936 (73.5)

2857 (73.5)

1531 (71.9)

771 (69.1)

 

 Male

342 (13.0)

408 (10.5)

208 (9.8)

133 (11.9)

 

 Mixed

319 (12.1)

520 (13.4)

325 (15.3)

188 (16.8)

 

 Unexplained

37 (1.4)

101 (2.6)

65 (3.1)

24 (2.2)

 

Infertility duration (years)

2.44 ± 1.83

3.16 ± 2.35

4.00 ± 3.28

4.18 ± 4.01

 < 0.001a

Parity

    

 < 0.001b

 0

2556 (97.0)

3681 (94.7)

1885 (88.5)

906 (81.2)

 

 > 0

78 (3.0)

205 (5.3)

244 (11.5)

210 (18.8)

 

FET cycle rank

    

 < 0.001b

 First

1703 (64.7)

2240 (57.6)

1179 (55.4)

589 (52.8)

 

 High order

931 (35.3)

1646 (42.4)

950 (44.6)

527 (47.2)

 

FET endometrial preparation

    

0.001b

 Natural cycle

539 (20.5)

898 (23.1)

529 (24.8)

282 (25.3)

 

 Artificial cycle

2095 (79.5)

2988 (76.9)

1600 (75.2)

834 (74.7)

 

Endometrial thickness (mm)

    

 < 0.001b

 < 8

178 (6.8)

277 (7.1)

190 (8.9)

132 (11.8)

 

 8–11

1479 (56.2)

2199 (56.6)

1222 (57.4)

627 (56.2)

 

 > 11

977 (37.1)

1410 (36.3)

717 (33.7)

357 (32.0)

 

Fertilization method

    

 < 0.001b

 IVF

1614 (61.3)

2463 (63.4)

1309 (61.5)

670 (60.0)

 

 ICSI

729 (27.7)

1002 (25.8)

613 (28.8)

386 (34.6)

 

 IVF + ICSI

291 (11.0)

421 (10.8)

207 (9.7)

60 (5.4)

 

Number of embryos transferred

    

0.583b

 1

2232 (84.7)

3272 (84.2)

1821 (85.5)

942 (84.4)

 

 ≥ 2

402 (15.3)

614 (15.8)

308 (14.5)

174 (15.6)

 

Embryo developmental stage at transfer

    

0.003b

 Day 3

427 (16.2)

694 (17.9)

407 (19.1)

234 (21.0)

 

 Day 5/6

2207 (83.8)

3192 (82.1)

1722 (80.9)

882 (79.0)

 

Delivery mode

    

 < 0.001b

 Natural birth

845 (32.1)

1139 (29.3)

504 (23.7)

219 (19.6)

 

 Cesarean section

1789 (67.9)

2747 (70.7)

1625 (76.3)

897 (80.4)

 
  1. Data are mean ± S.D. or n (%)
  2. aOne-way ANOVA
  3. bPearson chi-square test