Fig. 2

Cumulative proportion of children who developed first and subsequent LRTI. A Survival curves show cumulative proportions (%) of children who developed the first through fifth total LRTI episodes, including “non-severe LRTI”, “severe LRTI” and “undefined LRTI”. Although four children developed LRTI six times, the sixth episode is not shown in the figure. B Curves show the cumulative proportion (%) of children who developed "severe LRTI". Although two children developed severe LRTI four times and one developed it five times, the fourth and fifth episodes are not shown in the figure). Percentages (shown in brackets) show the cumulative proportion at 24 months of age. Abbreviation: LRTI, lower respiratory tract infection