Fig. 1

Probands. Exclusion criteria: invasive mechanical ventilation or noninvasive respiratory support like binasal continuous positive airway pressure (CPAP) with an additional oxygen requirement of > 0.25, failure to regain birth weight at the time of screening, ongoing phototherapy or indwelling central venous catheter /umbilical catheter. Study running: another patient was connected to the study monitor. Other reasons: Transfer, without information to study team, study team unavailable