Table 2.

Incidence of opaque bubble layer

Area covered (%)		Incidence (n)	Total flaps (n)
Opaque bubble layer
0.00–2.68	Mean −1 × SD	51	50.50
2.67–5.85	Mean −0.5 × SD	8	7.92
5.86–9.01	Mean +0.5 × SD	9	8.91
9.02–12.17	Mean +1 × SD	11	10.89
12.18–15.33	Mean +1.5 × SD	22	21.78

Note: Area increments are determined by mean coverage (5.8%) and SD.

Abbreviation: SD, standard deviation.