Table 2 The measurement procedure for both studies
From: Development of a cost effective three-dimensional posture analysis tool: validity and reliability
Mannequin study | Student study | |
|---|---|---|
Validity testing | ● reflective markers (14) were not removed until the validity testing was complete | ● one student measured per trial (27 students) |
● position one was captured three times, and position 2 to 7 was captured once | ● data capture commenced once student was settled behind desk | |
● capture commenced once the mannequin was in position | ● 81 trials in total (27 x 3) | |
● nine validity trials in total | ||
● 14 X-, Y- and Z coordinate measurements for both instruments | ||
Reliability testing | ● two repeated measurements of position one (trials eight and nine) | ● for repeated measurements, students were asked to stand after the first trial was captured, and then immediately to sit down, in the same position as previously, before the second trial was captured |
● researcher removed all reflective markers before replacing them, prior to capturing trial eight | ● this was repeated for the third measurement | |
● same procedure repeated for trial nine, without moving mannequin | ||
● no traces of the markers remained before replacing them for the next trial | ||
● removal and replacing reflective markers was undertaken to test reliability of operator’s marker placement |