Table 1 Description of the study groups, sex, nationality, median (range) for (weight, temperature, CRP, IgG and IgG subclasses)

Sex: girls n(%)

37 (54.4%)

25 (36.8%)

26 (37.7%)

0.06

Boys n(%)

31 (45.6%)

43 (63.2%)

43 (62.3%)

Nationality: non-Saudi n(%)

8 (11.8%)

4 (5.9%)

7 (10.1%)

0.48

Saudi n(%)

60 (88.2%)

64 (94.1%)

62 (89.9%)

Median (range) of:

Age/ day

1 (1-2)

1 (1-2)

1 (1-1)

<0.091

Weight/g

3390 (3095–4960)

2780 (2375–3175)

2030 (1335–2021)

<0.001

Temperature/°C

36.7 (35.5–37.0)

35.3 (34.6–35.9)

35.5 (35.0–37.5)

<0.001

CRP ng/ml

0.35 (0.04–0.86)

3.46 (2.15–4.71)

6.43 (3.77–8.25)

<0.001

IgG

0.70 (0.25–3.70)

2.05 (0.25–17.90)

0.57 (0.24–7.90)

<0.001

IgG1

2.19 (0.08–8.70)

5.60 (0.28–22.27)

3.20 (0.36–10.22)

<0.001

IgG2

0.68 (0.28–1.00)

8.37 (0.22–25.89)

1.52 (1.02–2.81)

<0.001

IgG3

4.48 (0.15–14.24)

6.50 (0.31–39.45)

4.78 (0.15–27.58)

<0.001

IgG4

0.28 (0.13–0.96)

0.34 (0.10–3.24)

0.39 (0.08–2.28)

0.001

TWBCs/ 10 ³ cells/ μl

10.43 (6.9–12.5)

14.45 (12.5–17.1)

21.72 (17.1–19.3)

<0.001

Neutrophils%

3.24 (0.4–5.2)

7.17 (5.2–9.1)

12.25 (9.3–12.5)

<0.001

Lymphocytes%

3.27 (0.78– 4.0)

4.79 (4.02–5.45)

6.76 (5.49–10.00)

<0.001

Monocytes%

0.49 (0.09–0.71)

1.51 (1.18–3.10)

1.5 (1.18–3.10)

<0.001