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Table 1 Analysis variables

From: Body temperature instability and respiratory morbidity in the very low birth weight infant: a multiple case, intensive longitudinal study

Variable Definition
Temperature
 Body Abdominal skin temp in oC
 Hypothermia Body temp < 36.5oC
 Hyperthermia Body temp > 37.2oC
 Euthermia Body temp 36.5oC to 37.2oC
 Hypothermic episode Begins when body temp < 36.5oC & ends when body temp ≥ 36.5oC (in min)
 Hyperthermic episode Begins when body temp < 37.2oC & ends when body temp ≥ 37.2oC (in min)
Acute Respiratory Morbidity
 Desaturation SpO2 < 90%
 Brady/Desaturation Heart rate < 100 & SpO2 < 90%
 Apnea Time of apnea plus 15 min prior & 5 min after
 FiO2 increase Time of FiO2 increase plus 15 min prior to & 5 min after
 RS increase Time of PIP, PEEP, or RR increase plus 15 min prior to & 5 min after
Chronic Respiratory Morbidity
 CRMR Diagnosis of BPD or SD
 BPD FiO2 > 21% at 28 DOL or 36 weeks PMA
 SD No diagnosis of BPD, but receiving scheduled diuretic dosing for respiratory symptoms at 36 weeks PMA
Covariates
 Chorioamnionitis Maternal diagnosis of chorioamnionitis
 GA Gestational age at birth in weeks
 Birthweight Birthweight in grams
 SGA Birthweight < 10th percentile on growth curve
 Sex Female or Male
 Apgar Scores Apgar score at 1 & 5 minutes
 Surfactant Received at least one dose of surfactant
 Infection Sepsis or presumed sepsis during the first 14 DOL
  1. temp temperature; FiO2 fraction of inspired air; SpO2 peripheral capillary oxygen saturation; min minute; RS respiratory support; BPD bronchopulmonary dysplasia; SD scheduled diuretics dosing; CRMR chronic respirtory morbidity risk; DOL days of life; PMA postmenstrual age; GA gestational age; SGA small for gestational age; IUGR intrauterine growth restriction