The choice of endoscopic surgical approach and four steps of operation of inverted papilloma of the maxillary sinus

Table 2 Comparison of baseline characteristics between single and multiple attachment sites

Variables	Single attach. (n = 31)	Multiple attach. (n = 52)	P value
Sex (male:female)	19:12	30:22	0.649^a
Average age, years	52.8 ± 4.1	53.9 ± 2.3	0.871^b
Primary:revision surgery	22:9	37:15	0.816^a

ISSN: 1471-2482