Biomedical Engineering Reference
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Hospitalizations per 1,000: Females
Hospitalizations per 1,000: Males
0
1
2
3
4
5
0
1
2
3
4
5
t (years)
t (years)
Days hospitalized per 1,000: Females
Days hospitalized per 1,000: Males
0
1
2
3
4
5
0
1
2
3
4
5
t (years)
t (years)
Fig. 4. Mean number of asthma-attributable hospitalizations (per 1,000 children) and
days hospitalized with 95% condence intervals for female (left panels) and male (right
panels) children free of other birth risk factors listed in Table 1, for t2(0; 5] yrs.
the literature on the bootstrap is quite sparse regarding recurrent events,
general bootstrap methods for the censored data, described by Efron
7
, could
probably be extended to the multiple failure time setting.
We assessed the eect of gender, birth weight and adverse neonatal res-
piratory conditions on the mean number of hospitalizations (event count
increment=0 or 1) and mean days hospitalized (increments of size0) for
pre-school asthma using the non-proportional means model. Male gender,
birth weight <2.5 kg, respiratory distress syndrome and severe birth as-
phyxia were all independently associated with an increase in mean number
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