Table 1.

Number of mismatches introduced to each observer and the number they actually identified during both phase 1 and phase 2. The time taken during each phase for each observer is also recorded

Observer	Without photographs (phase 1)			With photographs (phase 2)
	Number of mismatches introduced	Number of mismatches reported	Assessment time (min:s)	Number of mismatches introduced	Number of mismatches reported	Assessment time (min:s)
1	4	0	18:47	4	4	17:18
2	4	0	28:34	3	3	24:21
3	4	0	16:09	4	4	16:46
4	4	0	34:46	4	3	23:04
5	4	0	34:00	3	2a	21:26

^aAdditionally, this observer had a false positive