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. Author manuscript; available in PMC: 2012 Feb 15.
Published in final edited form as: J Off Stat. 1994;10(2):197–214.

TABLE 2.

Mean subjective ratings and objective indicators of performance by mode of administration.

Audio CASI5 Video CASI Paper SAQ P
SUBJECTIVE RATINGS (0–2 scale)
Liked best 1.53 1.23 0.24 <.01 1
Best for asking sensitive Qs. 1.29 1.21 0.50 <.01 1
Easiest to change answer 0.96 0.93 1.14 .61
Most interesting 1.72 1.11 0.15 .01 2
Easiest to use 1.57 0.91 0.53 <.01 2
Best for getting honest answers 1.30 1.16 0.54 <.01 1
Best for privacy after interview 1.37 1.36 0.27 <.01 1
Best for privacy during interview 1.34 1.07 0.60 <.01 1
Overall preference 1.38 1.10 0.51 <.01 2
OBJECTIVE INDICATORS
Minutes to Complete 9.26 9.03 8.88 .91
Requests For Help 0.67 1.21 0.44 .02 3
Proportion of Correct Skips 1.00 1.00 0.79 <.01 1
 Ns 4 35 35 35

Notes. The first eight rows of this table report means of respondents’ rankings, given on a scale of 0 (low) to 2 (high).

1

Mean for Paper SAQ was different from means for Video-CASI and Audio-CASI at p < 0.05 by t-test. Means for Video-CASI and Audio-CASI were not significantly different from each other by the same test. There was no significant association between reading level and mean score.

2

Mean for Paper SAQ was different from means for Video-CASI and Audio-CASI at p < 0.05 by t-test. Means for Video-CASI and Audio-CASI were different from each other at p < 0.05 by t-test. There was no significant association between reading level and mean score.

3

Mean for Paper SAQ was different from mean for Video-CASI (but not Audio-CASI) with p < 0.05 by t-test. A significant association was found between reading levels and scores (p < .05). (There were, on average, more requests for help from below-average readers [1.02] than from average readers [0.51].)

4

Ns shown are the minimum sample sizes for calculation of any proportion shown in the column.

5

In the Audio-CASI administration, questions were displayed on the PC screen simultaneously with their audio presentation. Respondents had the option of turning off this video display, but none did so.