Table 5.
Baseline (T1), postintervention (T2), and follow-up (T3) in change in behavior, transtheoretical model, perceived behavioral control, and knowledge of vegetable intake as a result of Web-based intervention among adults with an income of <¥3,000,000.a
| Variable | Intervention (n=326) | Control (n=225) | |||||||||
| T1 n (%) |
T2 n (%) |
T3 n (%) |
T1-T2 Pb |
T1-T3 Pb |
T1 n (%) |
T2 n (%) |
T3 n (%) |
T1-T2 Pb |
T1-T3 Pb |
||
| Eating vegetable behaviorc | <.001 | .008 | .13 | .005 | |||||||
| Almost every day | 24 (7.4) | 39 (12.0) | 32 (9.8) | 14 (6.2) | 14 (6.2) | 17 (7.6) | |||||
| 4-5 days/week | 36 (11.0) | 52 (16.0) | 38 (11.7) | 18 (8.0) | 21 (9.3) | 30 (13.3) | |||||
| 2-3 days/week | 91 (27.9) | 97 (29.8) | 109 (33.4) | 75 (33.3) | 79 (35.1) | 61 (27.1) | |||||
| Almost none | 175 (53.7) | 138 (42.3) | 147 (45.1) | 118 (52.4) | 111 (49.3) | 117 (52.0) | |||||
| Transtheoretical modeld | <.001 | .27 | .10 | .29 | |||||||
| Maintenance | 56 (17.2) | 74 (22.7) | 65 (19.9) | 27 (12.0) | 34 (15.1) | 40 (17.8) | |||||
| Action | 17 (5.2) | 16 (4.9) | 19 (5.8) | 10 (4.4) | 19 (8.4) | 9 (4.0) | |||||
| Preparation | 108 (33.1) | 123 (37.7) | 100 (30.7) | 82 (36.4) | 62 (27.6) | 64 (28.4) | |||||
| Contemplation | 84 (25.8) | 75 (23.0) | 83 (25.5) | 62 (27.6) | 68 (30.2) | 69 (30.7) | |||||
| Precontemplation | 61 (18.7) | 38 (11.7) | 59 (18.1) | 44 (19.6) | 42 (18.7) | 43 (19.1) | |||||
| Perceived behavioral controlc | <.001 | .06 | .32 | .25 | |||||||
| A lot of confidence | 15 (4.6) | 24 (7.4) | 16 (4.9) | 10 (4.4) | 9 (4.0) | 8 (3.6) | |||||
| Quite a lot of confidence | 30 (9.2) | 33 (10.1) | 38 (11.7) | 10 (4.4) | 18 (8.0) | 23 (10.2) | |||||
| A little confidence | 49 (15.0) | 56 (17.2) | 54 (16.6) | 33 (14.7) | 32 (14.2) | 33 (14.7) | |||||
| Not a lot of confidence | 108 (33.1) | 118 (36.2) | 109 (33.4) | 78 (34.7) | 72 (32.0) | 75 (33.3) | |||||
| Very little confidence | 51 (15.6) | 42 (12.9) | 41 (12.6) | 40 (17.8) | 40 (17.8) | 29 (12.9) | |||||
| Not any confidence | 73 (22.4) | 53 (16.3) | 68 (20.9) | 54 (24.0) | 54 (24.0) | 57 (25.3) | |||||
| Knowledge | <.001 | <.001 | <.001 | <.001 | |||||||
| Yes | 106 (32.5) | 174 (53.4) | 177 (54.3) | 60 (26.7) | 90 (40.0) | 93 (41.3) | |||||
| No | 220 (67.5) | 152 (46.6) | 149 (45.7) | 165 (73.3) | 135 (60.0) | 132 (58.7) | |||||
a¥120=US $1 (October 2015).
bOrdinal scale: Wilcoxon signed rank test, Bonferroni-corrected post hoc comparisons made using Mann-Whitney U test (P<.05/3=.02). Nominal scale: McNemar test, Bonferroni-corrected post hoc comparisons made using chi-square test (P<.05/3=.02).
cThe percentage might not reach 100% in some cases because the rate was rounded off.
dTranstheoretical model (TTM) 5 stages of change: (1) maintenance (I have continued to eat them for more than 6 months); (2) action (I have continued to eat them for less than 6 months); (3) preparation (I sometimes eat them or intend to eat them within the next 30 days); (4) contemplation (although I do not eat them currently, I intend to start eating them within the next 6 months); (5) precontemplation (I do not eat them and I do not intend to start eating them within the next 6 months).