can cover the maximum number of students. Table
3 shows the recommended dimensions for a new
desktop–chair with the criteria for use in four elected
tertiary institutions, Uasin-Gishu County, Kenya.
4.2 Design of the desktop–chair
After, running the analysis of the recorded data, as
shown in Table 3 there is only one type of innovative
ergonomically suitable desktop–chair that was identified in the four selected tertiary institutions (the
dimensions were the same in the respective institutions), as drawn in Figures 3a and 3b using 3D
SolidWorks 2019 software.
Table 3. Recommended dimensions for a new desktop–
chair for use in tertiary institutions, Uasin-Gishu County,
Kenya.
Anthropo- Design
Seat
metric
dimensions Criteria/
feature
measure
(cm)
Determinant References
Seat height
Popliteal
height
40.95
5th percentile
of popliteal
height + 0.45
cm shoe heel
allowance
(Ismail
et al. 2013)
Seat width
Hip
breadth
45.26
95th
percentile of
hip-breadth +
15%
allowance for
clothing
(Musa &
Ismaila
2014)
Seat depth
Buttock
popliteal
length
38.10
5th percentile
of buttock
popliteal
length
(Mohamed
et al. 2010)
Desktop
height from
seat
Elbow
height
19.11
5th percentile
of elbow
height
(Musa
et al. 2014)
Backrest
height
Shoulder
height
50.96
5th percentile
of shoulder
height
(Mohamed
et al. 2010)
Desktop
width
–
24.20
Literature
review
suggestions
(Ismaila
et al. 2013)
Desktop
length
Forearm
fingertip
length
47.44
50th
percentile of
forearm
fingertip
length
(Ismaila
et al. 2013)
Backrest
angle
–
109 ◦
Literature
review
suggestions
(Mohamed
et al. 2010)
Desk angle
–
0 ◦
From
literature
review
(Ansari
et al. 2018)
Seat angle
–
110 ◦
From
literature
review
(Igbokwe
et al. 2019)
Figure 3a. Sketches of the proposed adjustable students’
desktop–chair.
Figure 3b. Complete model of the proposed adjustable
students’ desktop–chair.
5 CONCLUSION AND RECOMMENDATIONS
5.1 Conclusions
From the present study, it is well expected that the
determining criteria for an adjustable desktop–chair
42
3 shows the recommended dimensions for a new
desktop–chair with the criteria for use in four elected
tertiary institutions, Uasin-Gishu County, Kenya.
4.2 Design of the desktop–chair
After, running the analysis of the recorded data, as
shown in Table 3 there is only one type of innovative
ergonomically suitable desktop–chair that was identified in the four selected tertiary institutions (the
dimensions were the same in the respective institutions), as drawn in Figures 3a and 3b using 3D
SolidWorks 2019 software.
Table 3. Recommended dimensions for a new desktop–
chair for use in tertiary institutions, Uasin-Gishu County,
Kenya.
Anthropo- Design
Seat
metric
dimensions Criteria/
feature
measure
(cm)
Determinant References
Seat height
Popliteal
height
40.95
5th percentile
of popliteal
height + 0.45
cm shoe heel
allowance
(Ismail
et al. 2013)
Seat width
Hip
breadth
45.26
95th
percentile of
hip-breadth +
15%
allowance for
clothing
(Musa &
Ismaila
2014)
Seat depth
Buttock
popliteal
length
38.10
5th percentile
of buttock
popliteal
length
(Mohamed
et al. 2010)
Desktop
height from
seat
Elbow
height
19.11
5th percentile
of elbow
height
(Musa
et al. 2014)
Backrest
height
Shoulder
height
50.96
5th percentile
of shoulder
height
(Mohamed
et al. 2010)
Desktop
width
–
24.20
Literature
review
suggestions
(Ismaila
et al. 2013)
Desktop
length
Forearm
fingertip
length
47.44
50th
percentile of
forearm
fingertip
length
(Ismaila
et al. 2013)
Backrest
angle
–
109 ◦
Literature
review
suggestions
(Mohamed
et al. 2010)
Desk angle
–
0 ◦
From
literature
review
(Ansari
et al. 2018)
Seat angle
–
110 ◦
From
literature
review
(Igbokwe
et al. 2019)
Figure 3a. Sketches of the proposed adjustable students’
desktop–chair.
Figure 3b. Complete model of the proposed adjustable
students’ desktop–chair.
5 CONCLUSION AND RECOMMENDATIONS
5.1 Conclusions
From the present study, it is well expected that the
determining criteria for an adjustable desktop–chair
42