Table 1.

Incidence of rhinosinusitis in the groups of the study by Hilding (1941).

Group I: widening of natural ostium	3 RS (+)/0 RS (−)
Group II: window in the medial sinus floor	2 RS (+)/1 RS (−)
Group III: medial and upper window	0 RS (+)/3 RS (−)
Group IV: window in the anterior recess	0 RS (+)/3 RS (−)
Control	0 RS (+)/6 RS (−)

RS, rhinosinusitis.