Table 2 Relationship between patients’ characteristics, index visit assessment, laboratory investigations of patients’ index ED visit and their 72 h. Return to ED

Patient characteristics

Age (years)

28 (21–35)

29 (22–34)

0.605

Gender

Male

41 (56.2%)

29 (61.7%)

0.548

Female

32 (43.8%)

18 (38.3%)

Has comorbidities

26 (35.6%)

23 (48.9%)

0.147

History of transfusion exchange

32 (43.8%)

20 (42.6%)

0.89

Hydroxyurea use

Not on hydroxyurea

6 (8.2%)

3 (6.4%)

0.649

On hydroxyurea - compliant

39 (53.4%)

22 (46.8%)

On hydroxyurea - noncompliant

28 (38.4%)

22 (46.8%)

Index visit

Pain score

5.5 (4–8)

6 (5–8)

0.383

Opioids administered

67 (91.8%)

42 (89.4%)

0.75

Time to first opioid dose (minutes)

87 (34–180)

61 (20–150)

0.073

Opioid dose total (mg)

10 (5–15)

10 (5–15)

0.877

Discharge on opioids

38 (52.1%)

19 (40.4%)

0.213

Number of previous ED visits*

9 (4–21)

10 (7–32)

0.245

Number of previous admissions*

5 (2–15)

6 (3–16)

0.548

Laboratory investigations

WBC (x10³cells/µl)

13.35 (10.88–15.95)

13.3 (10.18–16.71)

0.917

Hb (g/dL)

9 (8.08–10.13)

9.35 (8.38–10.83)

0.181

Neutrophil (x10³cells/µl)

7.25 (5.63–9.63)

7.2 (5.23–9.7)

0.934

MCV (fL)

90.3 (82.93–95.75)

91.1 (83.95–95.05)

0.582

PLT (x10³cells/µl)

412.5 (309.25–517)

416.5 (263.25–480)

0.451

LDH (IU/L)

429 (373–600)

467.5 (308.75–573.75)

0.829

Total bilirubin (µmol/L)

40.85 (29.91–66.08)

47.45 (36.95–75.47)

0.195

Direct bilirubin (µmol/L)

7.58 (5.74–10.59)

8.67 (6.28–13.05)

0.11