Table 3 Seasonality of birth among children diagnosed with a CNS tumour in the Nordic countries

From: Infectious exposure in the first years of life and risk of central nervous system tumours in children: analysis of birth order, childcare attendance and seasonality of birth

 

Age (years)

Sex

 

W&E's test b

ICCC group a

0–4

5–14

Boys

Girls

Total

χ 2 -value

P -value

Ependymoma

196

115

172

139

311

2.70

0.26

Astrocytoma

550

578

570

558

1128

3.35

0.19

Embryonal CNS tumour

283

236

306

213

519

0.79

0.67

Other glioma

82

135

103

114

217

0.49

0.78

Other specified CNS tumour

126

252

213

165

378

0.27

0.87

Unspecified CNS tumour

99

119

121

97

218

0.28

0.87

All CNSc

1336

1435

1485

1286

2771

2.35

0.31

Analysis restricted by age group

 All CNS aged 0–4 years

     

4.55

0.10

 All CNS aged 5–14

     

0.45

0.80

  1. Abbreviation: CNS=central nervous system.
  2. aTumours classified according to the international classification of childhood cancer (ICCC) version 3, main group III are included.
  3. bWalther and Edwards test.
  4. cIn total 2771 children were born and diagnosed with a CNS tumour during 1985–2006.
  5. Background population of the Nordic countries during 1985–2006 (10 575 793 children).
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