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Table 3 Sub-group analyses

From: The weekend effect: does hospital mortality differ by day of the week? A systematic review and meta-analysis

Subgroup

Number of analyses

OR (95% CI)

p-value

I2 (%)

All Analysesa

50

1.07 (1.03, 1.12)

0.002

97.6

Date of publicationb

 • Pre-October 13th 2015c

30

1.09 (1.02, 1.17)

0.009

97.5%

 • Post-October 13th 2015

20

1.06 (1.03, 1.09)

< 0.001

84.0%

Study sample size

 • Less than 10,000

15

1.03 (0.89, 1.18)

0.72

57.9%

 • 10,000 to 100,000

15

1.08 (1.04, 1.13)

< 0.001

57.1%

 • 100,000 to 1,000,000

8

1.08 (1.04, 1.30)

0.001

81.9%

 • Over 1,000,000

12

1.11 (1.02, 1.21)

0.015

99.4%

Database type

 • Administrative

41

1.09 (1.04, 1.15)

< 0.001

98.0%

 • Clinical registry/audit

9

1.03 (0.98, 1.09)

0.25

57.8%

Measure of severity

 • No measure of severity

37

1.08 (1.03, 1.14)

0.004

98.2%

 • Measure of severity

13

1.06 (1.02, 1.10)

< 0.001

43.5%

  1. a50 analyses from 34 published articles
  2. bDate of publication was used rather than submission as date of submission was not available for all articles
  3. cThe 13th October 2015 was the date of the Minister Of Health’s statement in the House of Commons about the weekend effect