946
K.Z. Gajos et al. / Artificial Intelligence 174 (2010) 910–950Table 5Average subjective ranking bye ciency and overall preference (best, 3
=
worst).
Motor-impaired
Able-bodied
Ability-based
Baseline
Preference-based
Ability-based
Baseline
Preference-based
Efficiency
1.48 2.61 1.91 1.71 2.29 Overall rank 2.48 1.88 1.95 2.00 When asked to rank-order the three interface variants of each application bye ciency of use and overall preference Table, both groups of participants ranked ability-based interfaces as most efficient,
followed by preference-based, and then baseline interfaces. This result was only significant for participants with motor impairments (
χ2
(2
,N=
33
)=
21
.15,
p< .001).
With respect to overall preference, participants with motor impairments significantly preferred the two personalized types of interfaces than the baselines (
χ2
(2
,N=
33
)=
12
.61,
p< .01). Able-bodied participants had no detectable preference for any of the interface variants.
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