Table 1 Observational studies measuring SpO₂ in the first few minutes of life in the delivery room where no infant received supplemental oxygen.

Study	Gestation (weeks)	Type of oximeter	Sensor location	n	SpO2 (%)			Comments
					1 min	5 min	10 min
Harris et al20	>37	Nellcor N‐100	Postductal	32	61 (5)*	NA	NA	Vaginal delivery
				44	46 (3)*			C/S
Toth et al22	⩾35	Nellcor N‐300	Preductal	50	NA	84 (48–99)†	92 (65–99)†	48 spontaneous deliveries, 2 vacuum extraction
			Postductal			78 (42–97)†	89 (62–99)†
Rabi et al29	⩾35	Masimo Radical	Preductal	45	NA	87 (80–95)‡	NA	Vaginal delivery	Calgary (1049 m)
						81 (75–83)‡		C/S	Calgary (1049 m)
Kamlin et al18	⩾31	Masimo Radical	Preductal	175	63 (53–68)‡	90 (79–91)‡	NA	51 preterm
								124 term infants
Gonzales and Salirrosas28	>37	Nellcor N‐20	Postductal	37	42 (2)*	NA	NA	Cerro de Pasco (4340 m)
				131	61 (1)*			Lima (150 m) sea level
Gungor et al30	>37	Air‐Shields Vickers 19040	Preductal	70	69 (0.7)§	90 (2)§	NA	No suction
				70	70 (0.7)§	80 (2)§	92 (0.4)§	Suction

C/S, caesarean section; IQR, interquartile range; NA, not available; SpO_2, saturation by pulse oximetry.

*Mean (SEM); †mean (range); ‡median (IQR); §mean(SD).