Table 1

Complications of varicella infection requiring hospitalisation and the position in the family (n = 111)

Position in familyMedian age (years) (interquartile range)Observed
(n (%))
Expected1-152
(n (%))
OR (95% CI)
Only child5.0  (1.8, 7.7)1-150 18  (16)27  (24)0.67  (0.39   to  1.14)
Oldest sibling6.8 (5.6, 8.6)25 (23)36 (32)0.69 (0.45   to  1.08)
Younger sibling4.1 (1.8, 7.6)1-150 68 (61)48 (44)1.42 (1.09   to  1.84)1-151
Total5.6 (2.0, 7.6)111 (100)111 (100)
  • 1-150 p = 0.497 (Mann-Whitney U test).

  • 1-151 p = 0.0007 (χ2 test).

  • 1-152 From the population statistics of the canton of Bern.