Table 2

Effort frequency distribution for different groups

Group no.	No. lifting conditions	Observation no.	Effort
Group no.	No. lifting conditions	Observation no.	1	2	3	4	5	6	7
Refer to appendix for grouping, lifting conditions, and observation number.
1	1	1	0.90	0.09	0.01	0.00	0.00	0.00	0.00
2	3	2–4	0.65	0.28	0.06	0.01	0.00	0.00	0.00
3	7	5–11	0.40	0.38	0.17	0.03	0.01	0.00	0.00
4	10	12–21	0.24	0.38	0.26	0.09	0.02	0.01	0.00
5	12	22–33	0.13	0.30	0.30	0.18	0.06	0.02	0.01
6	14	34–47	0.05	0.23	0.30	0.23	0.13	0.04	0.01
7	13	48–60	0.02	0.14	0.24	0.25	0.21	0.10	0.04
8	10	61–70	0.01	0.08	0.19	0.22	0.24	0.18	0.08
9	7	71–77	0.00	0.05	0.11	0.18	0.24	0.22	0.19
10	3	78–80	0.00	0.02	0.08	0.12	0.15	0.29	0.33
11	1	81	0.00	0.01	0.05	0.06	0.13	0.17	0.59