Table 1 Comparison of maternal and pregnancy related characteristics between the pandemic year (January–December 2020) and the equivalent period preceding the pandemic in 2019

Periods

< 0.001

 Period 1 Jan-Feb

179,743 (15.7)^a

172,071 (16.0)^b

 Period 2 March–May

282,405 (24.7)^a

261,500 (24.2)^b

 Period 3 June–August

307,819 (27.0)^a

295,911 (27.4)^b

 Period 4 September–October

191,347 (16.8)^a

183,478 (17.0)^b

 Period 5 November–December

180,071 (15.8)^a

165,569 (15.4)^b

Maternal age (years)*

< 0.001

  < 20

39,994 (3.5)^a

44,840 (4.2)^b

 20–34

906,164 (79.4)^a

861,148 (79.8)^b

  ≥ 35

182,934 (16.1)^a

172,535 (16.0)^b

Gestational Age categories (weeks+days)

< 0.001

  ≥ 37 week

1,015,624 (88.98)^a

960,095 (89.01)^a

 32 + 0–36 + 6

111,469 (9.77)^a

105,557 (9.79)^a

 28 + 0–31 + 6

9929 (0.87)^a

9066 (0.84)^b

 22 + 0–27 + 6

4363 (0.38)^a

3811 (0.35)^b

Mode of delivery

< 0.001

 Spontaneous vaginal delivery

482,703 (42.3)^a

428,957 (39.8)^b

 Total CS rate

658,682 (57.7)^a

649,572 (60.2) ^b

Primary versus Previous CS

< 0.001

 Spontaneous vaginal delivery

477,043 (41.8) ^a

424,061 (39.3) ^b

 Spontaneous vaginal delivery (Previous CS history)

5660 (0.5) ^a

4896 (0.5) ^b

 Primary CS

329,051 (28.8) ^a

331,932 (30.8) ^b

 Repeated CS

329,631 (28.9) ^a

317,640 (29.4) ^b

Parity

0.138

 Nulliparity

419,758 (36.8)

397,677 (36.9)

 Multiparity

721,627 (63.2)

680,852 (63.1)

Pregnancy

< 0.001

 Singleton

1,103,298 (96.7) ^a

1,044,879 (96.9) ^b

 Multiple

38,087 (3.3) ^a

33,650 (3.1) ^b

Presentation

< 0.001

 Cephalic

1,056,275 (92.5) ^a

996,902 (92.4) ^b

 Breech

64,227 (5.6) ^a

61,093 (5.7) ^a

 Abnormal lie

20,883 (1.8) ^a

20,534 (1.9) ^b

Onset of labor

< 0.001

 Spontaneous

1,012,234 (88.7) ^a

965,862 (89.6) ^b

 Induced

129,151 (11.3) ^a

112,667 (10.4) ^b

Health service category

< 0.001

 Public hospital

555,120 (48.6) ^a

490,923 (45.5) ^b

 Private hospital

507,708 (44.5) ^a

518,075 (48.0) ^b

 University hospital

78,557 (6.9) ^a

69,531 (6.4) ^b

Infant sex

0.785

 Female

555,992 (48.7)

525,176 (48.7)

 Male

585,393 (51.3)

553,353 (51.3)

Birth weight

< 0.001

  ≥ 2500 g

1,050,314 (92.02) ^a

995,890 (92.34) ^b

 1500- < 2500 g

78,946 (6.92) ^a

71,796 (6.66) ^b

 1000- < 1500 g

7641 (0.69) ^a

6887 (0.64) ^b

  < 1000 g

4484 (0.40) ^a

3956 (0.37) ^b

Province of residence (NUTS-12)

< 0.001

 Istanbul Region

197,743 (17.3) ^a

184,540 (17.1) ^b

 West Marmara Region

37,208 (3.3)

35,638 (3.3)

 Aegean Region

116,090 (10.2)

110,179 (10.2)

 East Marmara Region

102,760 (9.0)

96,762 (9.0)

 West Anatolia Region

99,898 (8.8)

93,843 (8.7)

 Mediterranean Region

143,862 (12.6)

136,206 (12.6)

 Central Anatolia Region

50,404 (4.4) ^a

47,365 (4.1) ^b

 West Black Sea Region

47,704 (4.2)

44,175 (4.1)

 East Black Sea

28,563 (2.5)

26,843 (2.5)

 Northeast Anatolia Region

39,017 (3.4)

36,715 (3.4)

 Central East Anatolia Region

72,440 (6.3)

68,005 (6.3)

 Southeast Anatolia Region

205,696 (18.0) ^a

198,258 (18.4) ^b