Table 3:
Factor analysis of fine motor skills in 78 men (30 controls and 48 welders)
| Factor | Factor description | Main variablesa | Variance explained |
|---|---|---|---|
|
| |||
| Factor 1 | ▲ Speed | ▼ Aiming duration overall dom. hand (−47) and nd. hand (−55), ▼ Inserting pins duration overall dom. hand (−71) and nd. hand (−72), ▲ Tapping hits dom. hand (79) and nd. hand (78) | 15.4% |
| Factor 2 | ▲ Steadiness | ▼ Steadiness mistakes dom. hand (−89) and nd. hand (−76), ▼ Steadiness duration of mistakes dom. hand (−88) and nd. hand (−57) | 12.4% |
| Factor 3 | ▲ Line tracing precision | ▼ Line tracing mistakes dom. hand (−67) and nd. hand (−81), ▼ Line tracing duration of mistakes dom. hand (−52) and nd. hand (−77) | 11.4% |
| Factor 4 | ▲ Line tracing speed | ▼ Line tracing duration overall dom. hand (−89) and nd. hand (−94) | 10.6% |
| Factor 5 | ▲ Aiming dom. hand | ▼ Aiming mistakes dom. hand (−92), ▼ Aiming duration of mistakes dom. hand (−90) | 9.9% |
| Factor 6 | ▲ Aiming nd. hand | ▼ Aiming mistakes nd. hand (−90), ▼ Aiming duration of mistakes nd. hand (−92) | 9.7% |
| Factor 7 | ▼ Tremor | ▼ Tremor amplitude dom. hand (88) and nd. hand (82) | 9.6% |
dom. hand: dominant hand and nd. hand: non-dominant hand; ▼ Smaller values correspond with better test results; ▲ Higher values correspond with better test results
a
Presentation is restricted to variables with an absolute value of the factor loading above 45. A full length table is presented as supplemental table S1.