Table 2 Incidence of maternal health outcomes from spontaneous pregnancies and from pregnancies by assisted reproductive technology (ART). The 2015 Pelotas (Brazil) Birth Cohort Study

n

%

n

%

p^a

Multiple pregnancies

< 0.001*

 Yes

51

1.2

4

22.2

 No

4150

98.8

14

77.8

Mode of delivery

0.001*

 Cesarean

2717

64.7

18

100.0

 Vaginal

1483

35.3

0

0.0

 Arterial hypertension

1066

25.4

2

11.1

0.27

 Pre-eclampsia

266

6.4

1

5.6

1.00

 Gestational diabetes

358

8.5

3

16.7

0.20

 Hospitalization

829

19.7

4

22.2

0.79

Weight gain during pregnancy

0.91

 Bellow IOM recommendations

1185

30.5

6

35.3

 Within IOM recommendations

1261

32.4

5

29.4

 Exceeded IOM recommendations

1446

37.2

6

35.3

Mean

DP

Mean

DP

p^b

Gestational weight gain (kg)

12.0

6.6

11.6

5.1

0.80

Weight at three months postpartum (kg)

69.6

15.3

69.5

12.8

0.97