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Table 1 Description of Maturity Category Cohorts

From: Thresholds for oximetry alarms and target range in the NICU: an observational assessment based on likely oxygen tension and maturity

Maturity category < 33 PMA 33–36 PMA > 36 PMA p
Subjects (n) 155 192 1031 na
Observations (n) 2603 2501 21,058 na
0bservations/subject (n) 12 (4–22) 9 (4–17) 11 (4–29) < 0.01
GA (weeks) 26 (24–28) 34 (33–35) 38 (37–39) < 0.001
PMA (weeks) 28 (26–31) 35 (34–36) 40 (39–43) < 0.001
Postnatal age (weeks) 2.1 (1.0–3.7) 1.1 (0.4–2.3) 2.0 (1.0–6.3) < 0.001
FiO2 (%) 45 (30–70) 50 (35–83) 45 (35–70) < 0.001
SpO2 (%) 93 (86–97) 96 (91–100) 97 (87–100) < 0.001
PaO2 (mmHg) 55 (45–71) 69 (50–100) 75 (47–112) < 0.001
PaO2 ≤ 40 (%) 15% 12% 15% < 0.001*
PaO2 50–80 (%) 43% 33% 24% < 0.001*
PaO2 ≥ 100 (%) 10% 25% 32% < 0.001*
PaO2/FiO2 130 (81–192) 161 (90–240) 167 (93–263) < 0.001
PaCO2 (mmHg) 45 (39–52) 45 (39–53) 45 (40–52) ns
pH 7.34 (7.28–7.40) 7.36 (7.30–7.41) 7.39 (7.34–7.43) < 0.001
  1. Statistical comparisons (Kruskal-Wallis and chi-square* as appropriate) among the 3 maturity categories are shown in Table