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Table 2 Clinical characteristics of the study population according to HCT2 (hematocrit in the first two hours of life)

From: Association between hematocrit in the first two hours of life and retinopathy during prematurity: a retrospective study from DRYAD

Variables

Total (n = 326)

Q1 (n = 108)

Q2 (n = 109)

Q3 (n = 109)

p -value

BW(g)

1375.5 ± 461.4

1141.0 ± 434.8

1397.7 ± 471.0

1585.7 ± 362.6

< 0.001

GA(w)

29.6 ± 2.6

28.0 ± 2.6

29.7 ± 2.4

31.1 ± 1.6

< 0.001

Sex

    

0.254

 female

122 (37.4)

47 (43.5)

36 (33)

39 (35.8)

 

 male

204 (62.6)

61 (56.5)

73 (67)

70 (64.2)

 

Multiple Pregnancy

    

0.881

 No

265 (81.3)

89 (82.4)

89 (81.7)

87 (79.8)

 

 Yes

61 (18.7)

19 (17.6)

20 (18.3)

22 (20.2)

 

Ans

    

1

 No

9 (2.8)

3 (2.8)

3 (2.8)

3 (2.8)

 

 Yes

317 (97.2)

105 (97.2)

106 (97.2)

106 (97.2)

 

Delivery Mode

    

0.413

 Cesarean section

196 (60.1)

68 (63)

60 (55)

68 (62.4)

 

 Vaginal delivery

130 (39.9)

40 (37)

49 (45)

41 (37.6)

 

Apgar1

5.9 ± 2.3

5.0 ± 2.3

6.1 ± 2.2

6.7 ± 1.9

< 0.001

Apgar5

7.5 ± 1.7

7.0 ± 1.7

7.5 ± 1.9

8.1 ± 1.4

< 0.001

Etippv

    

< 0.001

 No

269 (82.5)

67 (62)

97 (89)

105 (96.3)

 

 Yes

57 (17.5)

41 (38)

12 (11)

4 (3.7)

 

Drccompmeds

   

0.045

 No

313 (96.0)

100 (92.6)

105 (96.3)

108 (99.1)

 

 Yes

13 (4.0)

8 (7.4)

4 (3.7)

1 (0.9)

 

Atemp(℃)

36.9 ± 0.5

37.0 ± 0.5

36.9 ± 0.6

36.9 ± 0.4

0.348

Surfactant

    

< 0.001

 No

260 (79.8)

65 (60.2)

92 (84.4)

103 (94.5)

 

 Yes

66 (20.2)

43 (39.8)

17 (15.6)

6 (5.5)

 

Intub1d

    

< 0.001

 No

235 (72.1)

51 (47.2)

86 (78.9)

98 (89.9)

 

 Yes

91 (27.9)

57 (52.8)

23 (21.1)

11 (10.1)

 

Pneumothorax

   

0.224

 No

315 (96.6)

103 (95.4)

104 (95.4)

108 (99.1)

 

 Yes

11 (3.4)

5 (4.6)

5 (4.6)

1 (0.9)

 

Any intub

    

< 0.001

 No

215 (66.0)

43 (39.8)

77 (70.6)

95 (87.2)

 

 Yes

111 (34.0)

65 (60.2)

32 (29.4)

14 (12.8)

 

Any transfusion

   

< 0.001

 No

234 (71.8)

48 (44.4)

82 (75.2)

104 (95.4)

 

 Yes

92 (28.2)

60 (55.6)

27 (24.8)

5 (4.6)

 

Pkbili(mg/dl)

8.4 ± 2.6

7.1 ± 2.5

8.6 ± 2.6

9.6 ± 2.1

< 0.001

Anyrop

    

< 0.001

 No

248 (76.1)

58 (53.7)

87 (79.8)

103 (94.5)

 

 Yes

78 (23.9)

50 (46.3)

22 (20.2)

6 (5.5)

 
  1. The data are presented as the means ± SDs or numbers (proportions) for categorical variables
  2. BW, birth weight; GA, gestational age; Ans, antenatal steroids; Apgar1,1-minute Apgar; Apgar5,5-minute Apgar; Etippv, delivery room intubation and positive pressure ventilation; Drccompmeds, delivery room chest compression and/or resuscitation medication; Atemp, admission temperature in Celsius; Intub1d, intubation within 24 h of life; Any Intub, intubation any time during the NICU stay; Any transfusion, any pRBC transfusion during the NICU stay; Pkbili, peak bilirubin; Anyrop, retinopathy of prematurity (stage 1–3); Q1, Q2, and Q3 are quartiles of the HCT2 (hematocrit in the first two hours of life)
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BMC Pediatrics

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