Table 2.
Summary of video viewing habits compared between the Low Vision (LV) group and Normally-Sighted (NS) group. Number of hours watch TV per week is the sum of the hours reported for up to three TVs (questions 8, 14 and 20). Visual angles were computed from the reported size and viewing distances. Significant (p≤0.01) differences are indicated by bold font and differences that approached significance (0.01<p≤0.10) are underlined. The Mann-Whitney test was used to compare frequencies and other distributions of responses. The Pearson Chi-square (χ2) test was used to compare binary responses (e.g. Q26). For simplicity of presentation in this table, responses to some questions about frequency (e.g. Q27) were binarised (i.e. either “never” or “yes”). Comparisons of those frequencies are presented in the text.
| (Survey Questionnaire Number), Survey Question | LV Group Median (range) / proportion |
NS Group Median (range) / proportion |
Statistical test of difference |
|---|---|---|---|
| (6) Number of TVs at home | 2 (0 to 6) | 2 (0 to 5) | z196=1.65, p=0.10 |
| (7) Service provided by cable or satellite | 95/104 | 81/94 | χ21=2.02, p=0.16 |
| (8 +14 + 20) Duration for viewing TV (h) | 3.5 (0 to 10.5) | 3.0 (0 to 9.5) | z197=1.79, p=0.07 |
| (10) Viewing distance for the first TV (feet) | 5 (<2 to >10) | 7 (~3 to >10) | z195=8.5, p<0.001 |
| (11) Size of the first TV (inches) | 35 (~17 to ~60) | 25 (~12 to ~60) | z195=3.5, p<0.001 |
| Visual angle of first TV (from questions 10 and 11, degrees) | 38 (~12 to ~127) | 18 (~6.4 to ~44) | z195=9.1, p<0.001 |
| (12) First TV is HDTV | 47/103 | 30/93 | χ21=3.66, p=0.06 |
| (18) Second TV is HDTV | 18/61 | 5/42 | χ21=4.44, p=0.03 |
| (26) Computer at home | 87/104 | 78/94 | χ21=0.02, p=0.90 |
| (27) Viewing DVDs on computer | 22/84 | 25/78 | χ21=0.68, p=0.41 |
| (28) HD-DVD or Blu-ray on computer or TV | 12/104 | 10/94 | χ21=0.04, p=0.84 |
| (29) Internet access at home | 77/87 | 77/78 | χ21=6.02, p=0.014 |
| (30) Internet access elsewhere | 38/104 | 63/94 | χ21=18.4, p<0.001 |
| Internet access elsewhere if no computer at home | 2/17 | 5/16 | χ21=1.87, p=0.17 |
| (32) Internet access | 73/104 | 82/94 | χ21=8.43, p=0.004 |
| (33) Watching videos on internet | 40/73 | 54/82 | χ21=1.98, p=0.16 |
| (36) Viewing distance from computer (feet) | 0.75 (0.25 to 2.5) | 1.5 (0.25 to 2.5) | z152=4.1, p<0.001 |
| (37) Size of computer screen (inches) | 18 (10.5 to 25) | 16 (10.5 to 30) | z103=3.4, p<0.001 |
| Visual angle of computer screen (from questions 36 and 37, degrees) | 76 (33 to 153) | 53 (26 to 143) | z102=5.0, p<0.001 |
| (44) have video-capable handheld device | 24/102 | 29/91 | χ21=1.68, p=0.20 |
| (45) Used handheld device to watch videos | 16/104 | 20/94 | χ21=1.15, p=0.28 |
| (47) Use personal DVD player | 19/104 | 22/94 | χ21=0.79, p=0.37 |
| (48) Watch movies in theatre | 77/104 | 82/94 | χ21=5.44, p=0.02 |