Failure Mechanism Manual Power Stroller Total
count % of frame failures % of all tests count % of frame failures % of all tests count % of frame failures % of all tests count % of frame failures % of all tests
Seating-dependent A. Main Frame Member Fracture
20
48.8%
12.1%
6
8.7%
3.3%
13
18.1%
5.7%
39
21.3%
6.8%
B. Front Caster Deformation
11
26.8%
6.7%
3
4.3%
1.6%
16
22.2%
7.0%
30
16.4%
5.2%
C. Tilt/Recline Locking Mechanism Failure
3
7.3%
1.8%
4
5.8%
2.2%
16
22.2%
7.0%
23
12.6%
4.0%
D. Seatback Cane Fracture
3
7.3%
1.8%
5
7.2%
2.7%
6
8.3%
2.6%
14
7.7%
2.4%
E. Deformation of Seat Support
0
0.0%
0.0%
11
15.9%
6.0%
2
2.8%
0.9%
13
7.1%
2.3%
F. Severe Downward Deformation
0
0.0%
0.0%
1
1.4%
0.5%
9
12.5%
3.9%
10
5.5%
1.7%
Seating-dependent Total
32
78.0%
19.4%
29
42.0%
15.9%
53
73.6%
23.2%
114
62.3%
19.8%
Seating-independent G. Securement Bracket or Attachment Failure
7
17.1%
4.2%
34
49.3%
18.7%
12
16.7 %
5.3%
53
29.0%
9.2%
H. Footrest Failure
7
17.1%
4.2%
9
13.0%
4.9%
15
20.8%
6.6%
31
16.9%
5.4%
I. Deformation of Rear Wheel Assembly
1
2.4%
0.6%
11
15.9%
6.0%
0
0.0%
0.0%
12
6.6%
2.1%
Seating-independent Total
18
43.9%
10.9%
52
75.4%
28.6%
26
36.1%
11.4%
93
50.8%
16.2%