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Table 2 Methodological quality assessment of included studies

From: The prevention of anaphylactoid reactions to iodinated radiological contrast media: a systematic review

Study Allocation concealment Blinding Intention to treat analysis Predefined outcomes
Gates 1972 [13] No No Unclear No
Small 1982 [14] Unclear Unclear Unclear No
Bertrand 1992 [16] Unclear "Double-blind" Yes Yes
Ring 1985 [15] Unclear "Single" No Unclear
Lasser 1987 [17] Yes Yes Unclear Yes
Lasser 1994 [18] Yes Yes Yes Yes