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Table 1 Description of study population (n = 6861)

From: The relationship between breastfeeding and reported respiratory and gastrointestinal infection rates in young children

Characteristic N (%)
Sex
 Male 3504 (51.1)
 Female 3357 (48.9)
Country
 US-Colorado 1110 (16.2)
 US-Georgia/Florida 653 (9.5)
 US-Washington 1001 (14.6)
 US-satellite sites 7 (0.1)
 Germany 436 (6.4)
 Finland 1557 (22.7)
 Sweden 2097 (30.6)
Maternal Education
 Basic Primary 1252 (18.7)
 High School 1648 (24.6)
 Beyond High School 3800 (56.7)
 missing 161
Age of Mother at Birth
  < 25 years 763 (11.1)
 25–29 years 1997 (29.1)
 30–34 years 2470 (36.0)
  > 35 years 1631 (23.8)
Number of room in house residence
  ≤ 3 rooms 780 (11.7)
 3–6 rooms 3641 (54.4)
  > 6 rooms 2269 (33.9)
 missing 171
Maternal Working Status at 9 months
 Working 2385 (35.7)
 Not Working 4289 (64.3)
 missing 187
Maternal Smoking Status at 9 months
 Smoker 618 (9.2)
 Non-smoker 6092 (90.8)
 missing 151
Age Child Started Daycare or joined social group
  < 3 months 2065 (30.7)
 3–6 months 1647 (24.5)
 6–12 months 1266 (18.8)
 12–18 months 920 (13.7)
  ≥ 18 months or no 839 (12.5)
 missing 124
Child Birthweight
 SGA (< 2500 g) 221 (3.3)
 AGA (2500–4000 g) 5369 (90.2)
 LGA (> 4000 g) 1102 (16.5)
 missing 169
First Degree Relative with Type 1 Diabetes
 Yes 798 (11.6)
 No 6063 (88.4)
Single child in house at 9 months of age
 Yes 2806 (41.9)
 No 3896 (58.1)
 missing 159
Breastfeeding Duration
  < 3 months 1724 (25.2)
 3–6 months 834 (12.2)
 6–9 months 1420 (20.8)
 9–12 months 1299 (19.0)
 12–15 months 726 (10.6)
 15–18 months 335 (4.9)
  > 18 months 495 (7.3)
 missing 28
Exclusive Breastfeeding Duration
  < 3 months 5201 (75.8)
 3–6 months 1371 (20.0)
 6–9 months 287 (4.2)
 9–12 months 2 (0.0)