Table 6.
Baseline (T1), postintervention (T2), and follow-up (T3) in change in behavior, transtheoretical model, perceived behavioral control, and knowledge about vegetable intake in this Web-based intervention among adults with an income of ¥3,000,000-¥10,000,000.a
| Variable | Intervention (n=353) | Control (n=241) | |||||||||
| 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 | .38 | .12 | .03 | .02 | |||||||
| Almost every day | 32 (9.1) | 33 (9.3) | 34 (9.6) | 19 (7.9) | 19 (7.9) | 18 (7.5) | |||||
| 4-5 days/week | 50 (14.2) | 56 (15.9) | 73 (20.7) | 38 (15.8) | 44 (18.3) | 48 (19.9) | |||||
| 2-3 days/week | 125 (35.4) | 134 (38.0) | 120 (34.0) | 86 (35.7) | 103 (42.7) | 100 (41.5) | |||||
| Almost none | 146 (41.4) | 130 (36.8) | 126 (35.7) | 98 (40.7) | 75 (31.1) | 75 (31.1) | |||||
| Transtheoretical modelc,d | .25 | .14 | .07 | .24 | |||||||
| Maintenance | 87 (24.6) | 81 (22.9) | 77 (21.8) | 49 (20.3) | 64 (26.6) | 52 (21.6) | |||||
| Action | 23 (6.5) | 24 (6.8) | 42 (11.9) | 12 (5.0) | 15 (6.2) | 21 (8.7) | |||||
| Preparation | 106 (30.0) | 149 (42.2) | 128 (36.3) | 96 (39.8) | 84 (34.9) | 91 (37.8) | |||||
| Contemplation | 94 (26.6) | 72 (20.4) | 64 (18.1) | 61 (25.3) | 48 (19.9) | 54 (22.4) | |||||
| Precontemplation | 43 (12.2) | 27 (7.6) | 42 (11.9) | 23 (9.5) | 30 (12.4) | 23 (9.5) | |||||
| Perceived behavioral controlc | .58 | .15 | .04 | .95 | |||||||
| A lot of confidence | 19 (5.4) | 26 (7.4) | 19 (5.4) | 13 (5.4) | 18 (7.5) | 8 (3.3) | |||||
| Quite a lot of confidence | 53 (15.0) | 44 (12.5) | 47 (13.3) | 33 (13.7) | 36 (14.9) | 31 (12.9) | |||||
| A little confidence | 71 (20.1) | 71 (20.1) | 64 (18.1) | 45 (18.7) | 39 (16.2) | 47 (19.5) | |||||
| Not a lot of confidence | 122 (34.6) | 132 (37.4) | 135 (38.2) | 81 (33.6) | 94 (39.0) | 100 (41.5) | |||||
| Very little confidence | 48 (13.6) | 47 (13.3) | 43 (12.2) | 45 (18.7) | 36 (14.9) | 33 (13.7) | |||||
| Not any confidence | 40 (11.3) | 33 (9.3) | 45 (12.7) | 24 (10.0) | 18 (7.5) | 22 (9.1) | |||||
| Knowledge | <.001 | <.001 | <.001 | <.001 | |||||||
| Yes | 109 (30.9) | 186 (52.7) | 191 (54.1) | 69 (28.6) | 90 (37.3) | 110 (45.6) | |||||
| No | 244 (69.1) | 167 (47.3) | 162 (45.9) | 172 (71.4) | 151 (62.7) | 131 (54.4) | |||||
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).