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Table 1 National prevalence of certain health characteristics of Italian children and the expected cases for different enrolling scenarios in the NASCITA cohort study

From: NASCITA Italian birth cohort study: a study protocol

Characteristics

Italian prevalence (%)

5.000 enrollments (n°)

10.000 enrollments (n°)

15.000 enrollments (n°)

Sex (% male) [25]

51.3

2565

5130

7695

Gestational age at birth [25]

• < 37 weeks

6.9

345

690

1035

• 37–40 weeks

92.3

4615

9230

1385

• > 40 weeks

0.9

45

90

135

Twins/multiple birth [25]

1.7

85

170

255

Live birth rate after medically assisted procreation [25]

2.14

107

214

321

Birth defects [26]

2.0

100

200

300

Language disorders

Age 3.5 years [27]

7.5

375

750

1125

Maternal smoking during pregnancy [28]

7

350

700

1050

Breastfeeding (exclusive) [29]

• Until age 6 months

42.7

2135

4270

6405

• 6–12 months

5.5

275

550

825

Parental history of atopy [30]

22–37

1100–1850

2200–3700

3300–5550

Eczema prevalence

Age 36 months-5 years [30]

21.0

1050

2100

3150

Wheezing prevalence

Age 36 months-5 years [31, 32]

25.2

1260

2520

3780

Overweight prevalence

Age 2–6 years [33]

16

800

1600

2400