Table 2 : Inter-observer agreement of observational ratings of SLS.

No	Rater	Number of agreements	Total tasks	Percentage of agreements	Kappa agreements	Lower 95% CI** Kappa	Upper 95% CI** kappa
1	Rater 1 vs. Rater 2	8.3	10	0.83	0.6310	0.27210	0.99066
2	Rater 1 vs. Rater 3	8.3	10	0.83	0.6268	0.24665	0.99066
3	Rater 1 vs. Rater 4	8.3	10	0.83	0.6268	0.24665	0.99066
4	Rater 2 vs. Rater 3	9.5	10	0.95	0.9000	0.76822	1.00000
5	Rater 2 vs. Rater 4	9.5	10	0.95	0.9000	0.76822	1.00000
6	Rater 3 vs. Rater 4	10	10	10	1.0000	1.00000	1.00000