Table 2.
Variable descriptions of the experiment sample
| School sample | Market sample | Total sample | Sub-sample differences | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Timing† | Variable | Description | Mean | sd | Mean | sd | Mean | sd | χ 2 test‡ | df |
| Auction design characteristics | ||||||||||
| TARGET | Targeted sample (0 = school sample; 1 = market sample) | – | – | 0·52 | 0·50 | – | ||||
| TIMING | Timing of the auction (0 = morning; 1 = afternoon) | 0·67 | 0·48 | 0·76 | 0·43 | 0·71 | 0·45 | 1·27 | 1 | |
| Sociodemographic variables | ||||||||||
| At start | AGE | Age of the participant (years) | 21·10 | 1·41 | 40·42 | 10·18 | 31·07 | 12·17 | 212·39***‡ | 125 |
| EDUC | Education (0 = low; 1 = high)∥ | 1·00 | 0·00 | 0·26 | 0·44 | 0·61 | 0·49 | 72·89*** | 1 | |
| RICEPURCH | Responsible for the rice purchases in the household (0 = no; 1 = yes) | 0·05 | 2·20 | 0·94 | 0·24 | 0·52 | 0·50 | 99·54*** | 1 | |
| FARMER | Involved in farming activities (0 = not a farmer; 1 = farmer) | 0·62 | 0·49 | 0·62 | 0·49 | 0·62 | 0·49 | 0·003 | 1 | |
| FUTPREG | Intention to become pregnant in the future (0 = no; 1 = yes) | 0·97 | 0·18 | 0·09 | 0·29 | 0·51 | 0·50 | 96·44*** | 1 | |
| RESIDENCE | Residence (0 = urban; 1 = rural) | 0·73 | 0·45 | 0·89 | 0·31 | 0·82 | 0·39 | 5·43* | 1 | |
| Variables related to folate/folic acid | ||||||||||
| Before round 2 | FOLICUSE | Ever used folic acid supplements (0 = no; 1 = yes) | 0·12 | 0·32 | 0·27 | 0·45 | 0·20 | 0·40 | 4·81* | 1 |
| NTDKNOW | Knowledge of a women who delivered a baby with an NTD (0 = no; 1 = yes) | 0·38 | 0·49 | 0·45 | 0·50 | 0·42 | 0·49 | 0·65 | 1 | |
| Variables related to GM food | ||||||||||
| Before round 3 | SUBJKNOW | Subjective/perceived knowledge of GM food (0 = no; 1 = yes) | 0·97 | 0·18 | 0·35 | 0·48 | 0·64 | 0·48 | 53·31*** | 1 |
| OBJKNOW§ | Objective knowledge of GM food (% of correct statements) | 0·67 | 0·17 | 0·32 | 0·24 | 0·49 | 0·27 | 87·18***‡ | 125 | |
| INTENTION | If GM food would be available for consumption, I would eat it (1 = strongly disagree; 2 = disagree; 3 = neutral; 4 = agree; 5 = strongly agree) | 3·12 | 0·69 | 3·20 | 0·97 | 3·16 | 0·84 | 7·71 | 4 | |
| Variable related to the auctioned products | ||||||||||
| After round 3 | CHOICE | If you could buy the two auctioned products in the supermarket, which one would you buy? (0 = FBR, 1 = FAR; 2 = indifference) | 0·68 | 0·83 | 0·36 | 0·72 | 0·52 | 0·79 | 7·25* | 2 |
FBR, folate-biofortified rice; FAR, rice supplemented with folic acid pills; NTD, neural tube defect.
*P < 0·05, ***P < 0·001.
†The first column refers to the timing of the self-administered survey question. The auction design characteristics (TARGET and TIMING) are not included in the survey.
‡Due to the metric scale of the variables AGE and OBJKNOW, the figures refer to F values, based on one-way ANOVA.
§Objective knowledge is measured through six true-or-false statements, in line with previous research( 94 , 95 ).
∥A low and high education level refers to, respectively, primary/secondary school and college or above.