Table 2 Effect of previous pregnancy status on subsequent pregnancy outcomes

Age

30.16 ± 4.13

31.02 ± 4.79

< 0.001

29.86 ± 4.03

30.97 ± 4.49

29.89 ± 4.00

30.94 ± 4.54

First pregnancy age

26.55 ± 3.59

26.11 ± 4.09

0.060

26.30 ± 3.44

27.10 ± 3.89

26.31 ± 3.42

27.04 ± 3.92

BMI, kg/m²

22.29 ± 3.08

22.67 ± 3.82

0.065

22.19 ± 2.96

22.77 ± 3.31

22.17 ± 2.97

22.81 ± 3.30

Total pregnancy numbers

2.28 ± 1.22

2.32 ± 1.27

0.670

2.24 ± 1.17

2.39 ± 1.32

2.24 ± 1.17

2.35 ± 1.31

Previous pregnancy loss numbers

1.88 ± 0.97

1.80 ± 0.99

0.186

1.84 ± 0.95

2.00 ± 1.04

1.83 ± 0.96

1.97 ± 1.04

Pregnancy interval

-

-

-

17.02 ± 15.32

16.03 ± 12.27

17.06 ± 15.01

15.75 ± 11.77

Pre-pregnancy interventions

-

-

-

No

-

-

-

183 (55.45%)

147 (44.55%)

202 (58.72%)

142 (41.28%)

Yes

-

-

-

445 (68.78%)

202 (31.22%)

554 (75.48%)

180 (24.52%)

Pregnancy type

0.003

Primary

1005 (81.05%)

235 (18.95%)

504 (64.04%)

283 (35.96%)

609 (69.92%)

262 (30.08%)

Secondary

232 (73.42%)

84 (26.58%)

124 (65.26%)

66 (34.74%)

147 (71.01%)

60 (28.99%)

Induced abortion

0.883

No

1101 (79.55%)

283 (20.45%)

565 (64.35%)

313 (35.65%)

671 (70.04%)

287 (29.96%)

Yes

136 (79.07%)

36 (20.93%)

63 (63.64%)

36 (36.36%)

85 (70.83%)

35 (29.17%)

Previous live birth

0.003

No

1020 (80.95%)

240 (19.05%)

512 (64.08%)

287 (35.92%)

619 (69.94%)

266 (30.06%)

Yes

217 (73.31%)

79 (26.69%)

116 (65.17%)

62 (34.83%)

137 (70.98%)

56 (29.02%)

Previous delivery method

0.011

Vaginal delivery

137 (68.53%)

62 (31.47%)

72 (67.29%)

35 (32.71%)

89 (73.55%)

32 (26.45%)

Caesarean section

80 (82.47%)

17 (17.53%)

44 (63.77%)

25 (36.23%)

48 (67.61%)

23 (32.39%)

Previous birth defects

0.042

No

1200 (79.89%)

302 (20.11%)

606 (63.92%)

342 (36.08%)

730 (69.86%)

315 (30.14%)

Yes

37 (68.52%)

17 (31.48%)

22 (75.86%)

7 (24.14%)

26 (78.79%)

7 (21.21%)

Previous ectopic pregnancy

0.114

No

1182 (79.86%)

298 (20.14%)

598 (64.03%)

336 (35.97%)

720 (69.77%)

312 (30.23%)

Yes

55 (72.37%)

21 (27.63%)

30 (69.77%)

13 (30.23%)

36 (78.26%)

10 (21.74%)

Previous hydatidiform mole

0.347

No

1227 (79.42%)

318 (20.58%)

624 (64.33%)

346 (35.67%)

750 (70.16%)

319 (29.84%)

Yes

10 (90.91%)

1 (9.09%)

4 (57.14%)

3 (42.86%)

6 (66.67%)

3 (33.33%)

Menarche age

13.51 ± 1.25

13.57 ± 1.28

0.428

13.43 ± 1.21

13.56 ± 1.31

13.47 ± 1.22

13.58 ± 1.33

Menstrual cycle

0.658

Regular

1043 (79.68%)

266 (20.32%)

533 (64.84%)

289 (35.16%)

640 (70.56%)

267 (29.44%)

Irregular

194 (78.54%)

53 (21.46%)

95 (61.29%)

60 (38.71%)

116 (67.84%)

55 (32.16%)

Dysmenorrhea

0.689

no

482 (79.02%)

128 (20.98%)

241 (63.09%)

141 (36.91%)

284 (68.77%)

129 (31.23%)

mild

551 (78.94%)

147 (21.06%)

297 (67.81%)

141 (32.19%)

362 (73.13%)

133 (26.87%)

moderate

144 (82.76%)

30 (17.24%)

63 (55.26%)

51 (44.74%)

75 (62.50%)

45 (37.50%)

severe

60 (81.08%)

14 (18.92%)

27 (62.79%)

16 (37.21%)

35 (70.00%)

15 (30.00%)

Previous pelvic surgery

0.352

No

1086 (79.85%)

274 (20.15%)

541 (63.50%)

311 (36.50%)

659 (69.37%)

291 (30.63%)

Yes

151 (77.04%)

45 (22.96%)

87 (69.60%)

38 (30.40%)

97 (75.78%)

31 (24.22%)

Last pregnancy termination method

0.977

No intervention

380 (30.72%)

103 (32.29%)

198 (64.92%)

107 (35.08%)

233 (70.61%)

97 (29.39%)

Medical abortion

125 (10.11%)

32 (10.03%)

61 (61.62%)

38 (38.38%)

73 (66.97%)

36 (33.03%)

Surgical abortion

550 (44.46%)

138 (43.26%)

274 (63.72%)

156 (36.28%)

338 (69.55%)

148 (30.45%)

Medical + surgical abortion

132 (10.67%)

32 (10.03%)

66 (66.67%)

33 (33.33%)

79 (73.15%)

29 (26.85%)

Induced labor

50 (4.04%)

14 (4.39%)

29 (65.91%)

15 (34.09%)

33 (73.33%)

12 (26.67%)