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Table 1 General characteristics of study cohorts

From: Protecting newborns from pertussis – the challenge of complete cocooning

 

Birth year 2012

Birth year 2013

Total

N (%)

N (%)

N (%)

Newborn

426 (100)

458 (100)

884 (100)

   Sex, known

426 (100)

457 (99.7)

883 (99.9)

   Female

203 (48)

195 (43)

398 (45)

   Nationality, known

426 (100)

455 (99.3)

881 (99.7)

   Swissa

344 (81)

373 (81)

717 (81)

   Other

82 (19)

82 (18)

164 (19)

   Maternity clinic, known

426 (100)

455 (99.3)

881 (99.7)

   Hospital A

178 (42)

192 (42)

370 (42)

   Hospital B

113 (27)

125 (27)

238 (27)

   Hospital C

93 (22)

108 (24)

201 (23)

   Other

42 (10)

30 (7)

72 (8)

Mothers

426 (100)

458 (100)

884 (100)

   Age (in years), known

418 (98)

439 (96)

857 (97)

   Mean/Median

33/33

33/33

33/33

   IQR/Range

30-36/17-46

30-36/20-47

30-36/17-47

   Educational level, known b

421 (99)

451 (98)

872 (99)

   Compulsory school (ISCED 2)

21 (5)

17 (4)

38 (4)

   Apprenticeship (ISCED 3)

130 (31)

147 (32)

277 (31)

   Higher education (ISCED 4)

270 (63)

287 (63)

557 (63)

Fathers

424 (100)

453 (100)

877 (100)

   Age (in years), known

402 (95)

412 (91)

816 (93)

   Mean/Median

36/35

36/35

36/35

   IQR/Range

32-40/21-56

30-36/20-77

32-39/20-77

   Educational level, known b

418 (99)

442 (98)

860 (98)

   Compulsory school (ISCED 2)

19 (4)

23 (5)

42 (5)

   Apprenticeship (ISCED 3)

149 (35)

148 (33)

297 (34)

   Higher education (ISCED 4)

250 (59)

271 (60)

521 (59)

Cocoon size

   

   Siblings c

212 (100)

259 (100)

471 (100)

   Mean/Ranged

0.5/0-4

0.57/0-4

0.5/0-4

   Other close contact persons e

663 (100)

758 (100)

1421 (100)

   Mean/Ranged

1.6/0-7

1.7/0-5

1.6/0-7

   Total (including parents)

1725 (100)

1928 (100)

3653 (100)

   Mean/Ranged

4.0/1-11

4.2/1-9

4.1/1-11

  1. aIncluding newborns with multiple citizenships (Swiss plus other).
  2. bInternational Standard Classification of Education Levels.
  3. cTwin siblings and subsequently born siblings not included as these were not relevant for cocooning at time of birth of study infant.
  4. dNumber of close contacts per newborn.
  5. eOther than parents or siblings.