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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.