Table 3 . Frequency distribution of shoulder complaints at last week and year among trial groups before and after trial intervention .
| Time | Study groups | Total |
Before intervention n(%) |
Total |
After intervention n(%) |
p | ||
| Positive* | Negative** | Positive* | Negative** | |||||
| Last year | Lecture | 84 | 34 (40.5) | 50 (59.5) | 79 | 27 (34.2) | 52 (65.8) | 0.066 |
| Workshop | 84 | 27(32.1) | 57 (67.9) | 70 | 22 (31.4) | 48 (68.6) | 0.020 | |
| Pamphlet | 84 | 32 (38.1) | 52 (61.9) | 74 | 27 (36.5) | 47 (63.5) | 0.115 | |
| Last week | Lecture | 84 | 33 (39.3) | 51 (60.7) | 79 | 28 (35.4) | 51 (64.6) | 0.063 |
| Workshop | 84 | 24 (28.6) | 56 (71.4) | 70 | 14 (20.0) | 56 (80.0) | 0.002 | |
| Pamphlet | 84 | 30 (35.7) | 53 (64.3) | 74 | 26 (35.3) | 48 (64.7) | 0.054 | |
*positive: all of workers who had neck or shoulder pain in specific period of time that noted in the table
**negative: all of workers who had not neck or shoulder pain in specific period of time that noted in the table