TABLE 1.

Calculation of Effective Fio2, Step 1

Flow, L/minFactor With Weight of
0.7 kg1.0 kg1.25 kg1.5 kg2 kg2.5 kg3 kg3.5 kg4 kg
0.01111110000
0.03 (1/32)432221111
0.06 (1/16)965432222
0.125 (1/8)181210864444
0.152115121086544
0.25 (1/4)362520171310876
0.5 (1/2)715040332520171413
0.75 (3/4)1007560503830252119
1.0 (1.0)10010080675040332925
1.25100100100836350423631
1.51001001001007560504338
2.010010010010010080675750
3.01001001001001001001008675
  • Adapted from equations 3 and 4 in ref 1. The rule of thumb (implicit in the table) is that, for most infants in the STOP-ROP study, if flow (in liters per minute) exceeds body weight (in kilograms), then the effective Fio2 equals the nasal cannula oxygen concentration.