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Weights for the averaged TEFs in figure 2. Fixed-effects weights were derived from the reciprocal of the variances. The shape of these curves is a result of the distribution of events and therefore also of the patient population by the respective modifier. BMI, body mass index; OI, oxygenation index; PaO2/FiO2. PaO2/FiO2 ratio; RC, respiratory compliance; TEF, treatment effect function.
