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Table 8 Mean (on the log scale) of the ratios of confidence interval widths of Medline/database estimate to reference standard point estimate for dichotomous outcomes

From: The contribution of databases to the results of systematic reviews: a cross-sectional study

Database

Mean

Minimum

Q1

Median

Q3

Maximum

Acute Respiratory Infections (n = 37)

Medline (alone)

1.12

1.00

1.00

1.00

1.00

3.17

BIOSIS

1.11

1.00

1.00

1.00

1.00

3.17

CAB Direct

1.12

1.00

1.00

1.00

1.00

3.17

CINAHL

1.12

1.00

1.00

1.00

1.00

3.17

EMBASE

1.09

1.00

1.00

1.00

1.00

3.17

ERIC

1.12

1.00

1.00

1.00

1.00

3.17

HAPI

1.12

1.00

1.00

1.00

1.00

3.17

IPA

1.11

1.00

1.00

1.00

1.00

3.17

LILACS

1.12

1.00

1.00

1.00

1.00

3.17

PsycINFO

1.12

1.00

1.00

1.00

1.00

3.17

Infectious Diseases (n = 31)

Medline (alone)

1.10

1.00

1.00

1.00

1.00

2.67

BIOSIS

1.02

1.00

1.00

1.00

1.00

1.25

CAB Direct

1.10

1.00

1.00

1.00

1.00

2.67

CINAHL

1.10

1.00

1.00

1.00

1.00

2.67

EMBASE

1.08

1.00

1.00

1.00

1.00

2.67

ERIC

1.10

1.00

1.00

1.00

1.00

2.67

HAPI

1.10

1.00

1.00

1.00

1.00

2.67

IPA

1.09

1.00

1.00

1.00

1.00

2.67

LILACS

1.10

1.00

1.00

1.00

1.00

2.67

PsycINFO

1.10

1.00

1.00

1.00

1.00

2.67

Developmental, Psychosocial and Learning Problems (n = 16)

Medline/PsychINFO (alone)

1.16

1.00

1.00

1.00

1.20

2.14

BIOSIS

1.16

1.00

1.00

1.00

1.20

2.14

CAB Direct

1.16

1.00

1.00

1.00

1.20

2.14

CINAHL

1.16

1.00

1.00

1.00

1.20

2.14

EMBASE

1.16

1.00

1.00

1.00

1.20

2.14

ERIC

1.13

1.00

1.00

1.00

1.20

2.14

HAPI

1.16

1.00

1.00

1.00

1.20

2.14

IPA

1.16

1.00

1.00

1.00

1.20

2.14

LILACS

1.16

1.00

1.00

1.00

1.20

2.14