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Table 2 Methodological quality of included studies

From: Does zafirlukast reduce future risk of asthma exacerbations in adults? Systematic review and meta-analysis

Study

Randomly assigned

Allocation concealment

Multi- center

Blinding

Complete outcome data adequately addressed

Free of selective outcomes reporting

Other bias

Intention to treat

Sample size calculation

Power

Conflict of interest

Boushey 2005 [8]

Yes

Yes

Yes

Double-blind

Yes

Unclear

Unclear

No

Yes

0.90

No

Huang 2003 [9]

Yes

Yes

No

Double-blind

Yes

Unclear

Unclear

No

No

NA

No

Brabson 2002 [10]

Yes

Yes

Yes

Double-blind

Yes

Unclear

Unclear

Yes

Yes

0.80

No

Nathan 2001 [11]

Yes

Yes

Yes

Double-blind

Yes

Unclear

Unclear

No

Yes

0.80

No

Busse 2001 [12]

Yes

Yes

No

Double-blind

Yes

Unclear

Unclear

No

Yes

0.80

No

Kim 2000 [13]

Yes

Yes

No

Double-blind

Yes

Unclear

No

Yes

Yes

0.80

No

Virchow 2000 [14]

Yes

Yes

Yes

Double-blind

Yes

Unclear

Unclear

No

No

NA

No

Bleecker 2000 [15]

Yes

Yes

Yes

Double-blind

Yes

Unclear

No

Yes

Yes

0.80

No

Busse 1999 [16]

Yes

Yes

Yes

Double-blind

Yes

Unclear

Unclear

Yes

Yes

0.80

No

Nathan 1998 [17]

Yes

Yes

Yes

Double-blind

Yes

Unclear

Unclear

No

Yes

0.90

No

Fish 1997 [18]

Yes

Yes

Yes

Double-blind

Yes

Unclear

Unclear

No

Yes

0.90

No

Spector 1994 [19]

Yes

Yes

Yes

Double-blind

Yes

Unclear

No

No

Yes

0.90

No

  1. NA, not available.