Table 4

Diagnostic accuracy of mean and systolic blood pressure for prediction of low superior vena cava flow in preterm infants < 30 weeks gestation

SnSpPPVNPVLR+LR−
Values in parentheses are 95% confidence intervals.
BP, Blood pressure; LR+, positive likelihood ratio; LR−, negative likelihood ratio; NPV, negative predictive value; PPV, positive predictive value; Sn, sensitivity; Sp, specificity.
Systolic BP < 48 mm Hg
    3 hours100 (100 to 100)14 (7 to 21)15 (8 to 22)100 (100 to 100)1.170
    10 hours92 (87 to 97)39 (30 to 49)44 (35 to 54)90 (85 to 96)1.520.21
    All observations93 (90 to 96)35 (30 to 41)24 (19 to 28)96 (93 to 98)1.430.21
Systolic BP < 40 mm Hg
    3 hours69 (60 to 78)51 (41 to 61)18 (10 to 26)91 (86 to 97)1.420.60
    10 hours81 (74 to 88)65 (56 to 74)55 (45 to 64)87 (80 to 93)2.300.29
    All observations76 (71 to 81)68 (62 to 73)34 (28 to 39)93 (90 to 96)2.350.36
Mean BP < 30 mm Hg
    3 hours62 (57 to 71)58 (49 to 68)19 (11 to 26)91 (85 to 97)1.480.66
    10 hours62 (53 to 71)82 (74 to 89)64 (55 to 73)81 (73 to 88)3.400.46
    All observations59 (54 to 65)77 (72 to 82)36 (30 to 41)90 (86 to 93)2.560.53
Mean BP ⩽ gestation (in weeks) mm Hg
    3 hours38 (29 to 48)76 (68 to 85)20 (12 to 28)89 (83 to 95)1.620.81
    10 hours27 (19 to 35)92 (86 to 97)63 (53 to 72)71 (62 to 79)3.20.8
    All observations30 (25 to 35)88 (84 to 91)34 (29 to 39)85 (81 to 89)2.400.80