From: Characterising and justifying sample size sufficiency in interview-based studies: systematic analysis of qualitative health research over a 15-year period
Sample size of studies
BMJ (n = 21)
BJHP (n = 53)
SHI (n = 140)
Mean (SD) number of interviews
44.5 (29.3)
18.1 (10.4)
37.4 (28)
Min number of interviews
19
6
7
Max number of interviews
128
55
197
Median
31
15
30.5