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Forest plot of comparison: 1 Allopurinol versus control (placebo or no drug), outcome: 1.1 Death during the neonatal period and infancy.
Figuras y tablas -
Figure 1

Forest plot of comparison: 1 Allopurinol versus control (placebo or no drug), outcome: 1.1 Death during the neonatal period and infancy.

Forest plot of comparison: 1 Allopurinol versus control (placebo or no drug), outcome: 1.2 Death or severe neurodevelopmental disability.
Figuras y tablas -
Figure 2

Forest plot of comparison: 1 Allopurinol versus control (placebo or no drug), outcome: 1.2 Death or severe neurodevelopmental disability.

Forest plot of comparison: 1 Allopurinol versus control (placebo or no drug), outcome: 1.3 Severe quadriplegia in surviving infants.
Figuras y tablas -
Figure 3

Forest plot of comparison: 1 Allopurinol versus control (placebo or no drug), outcome: 1.3 Severe quadriplegia in surviving infants.

Forest plot of comparison: 1 Allopurinol versus control (placebo or no drug), outcome: 1.4 Seizures during the neonatal period.
Figuras y tablas -
Figure 4

Forest plot of comparison: 1 Allopurinol versus control (placebo or no drug), outcome: 1.4 Seizures during the neonatal period.

Forest plot of comparison: 1 Allopurinol versus control (placebo or no drug), outcome: 1.5 Abnormalities on brain imaging.
Figuras y tablas -
Figure 5

Forest plot of comparison: 1 Allopurinol versus control (placebo or no drug), outcome: 1.5 Abnormalities on brain imaging.

'Risk of bias' graph: review authors' judgements about each 'Risk of bias' item presented as percentages across all included studies.
Figuras y tablas -
Figure 6

'Risk of bias' graph: review authors' judgements about each 'Risk of bias' item presented as percentages across all included studies.

Comparison 1 Allopurinol versus control (placebo or no drug), Outcome 1 Death during the neonatal period and infancy.
Figuras y tablas -
Analysis 1.1

Comparison 1 Allopurinol versus control (placebo or no drug), Outcome 1 Death during the neonatal period and infancy.

Comparison 1 Allopurinol versus control (placebo or no drug), Outcome 2 Death or severe neurodevelopmental disability.
Figuras y tablas -
Analysis 1.2

Comparison 1 Allopurinol versus control (placebo or no drug), Outcome 2 Death or severe neurodevelopmental disability.

Comparison 1 Allopurinol versus control (placebo or no drug), Outcome 3 Severe quadriplegia in surviving infants.
Figuras y tablas -
Analysis 1.3

Comparison 1 Allopurinol versus control (placebo or no drug), Outcome 3 Severe quadriplegia in surviving infants.

Comparison 1 Allopurinol versus control (placebo or no drug), Outcome 4 Seizures during the neonatal period.
Figuras y tablas -
Analysis 1.4

Comparison 1 Allopurinol versus control (placebo or no drug), Outcome 4 Seizures during the neonatal period.

Comparison 1 Allopurinol versus control (placebo or no drug), Outcome 5 Abnormalities on brain imaging.
Figuras y tablas -
Analysis 1.5

Comparison 1 Allopurinol versus control (placebo or no drug), Outcome 5 Abnormalities on brain imaging.

Comparison 1. Allopurinol versus control (placebo or no drug)

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Death during the neonatal period and infancy Show forest plot

3

Risk Ratio (M‐H, Fixed, 95% CI)

Subtotals only

1.1 All infants

3

114

Risk Ratio (M‐H, Fixed, 95% CI)

0.88 [0.56, 1.38]

1.2 Infants with severe encephalopathy

2

41

Risk Ratio (M‐H, Fixed, 95% CI)

0.97 [0.62, 1.51]

2 Death or severe neurodevelopmental disability Show forest plot

3

Risk Ratio (M‐H, Fixed, 95% CI)

Subtotals only

2.1 All infants

3

110

Risk Ratio (M‐H, Fixed, 95% CI)

0.78 [0.56, 1.08]

2.2 Infants with severe encephalopathy

2

41

Risk Ratio (M‐H, Fixed, 95% CI)

0.92 [0.66, 1.30]

3 Severe quadriplegia in surviving infants Show forest plot

3

73

Risk Ratio (M‐H, Fixed, 95% CI)

0.59 [0.28, 1.27]

4 Seizures during the neonatal period Show forest plot

3

114

Risk Ratio (M‐H, Fixed, 95% CI)

0.93 [0.75, 1.16]

5 Abnormalities on brain imaging Show forest plot

1

Risk Ratio (M‐H, Fixed, 95% CI)

Subtotals only

5.1 Cranial ultrasound

1

31

Risk Ratio (M‐H, Fixed, 95% CI)

1.12 [0.81, 1.55]

5.2 Magnetic resonance imaging (surviving infants)

1

9

Risk Ratio (M‐H, Fixed, 95% CI)

1.88 [0.56, 6.31]

Figuras y tablas -
Comparison 1. Allopurinol versus control (placebo or no drug)