Item | Item Question | CTT | IRM | |||||
---|---|---|---|---|---|---|---|---|
Mean (SD) | CITC | Difficulty differences | ||||||
Boy - Girla | 8-10 yo – 11-13 yob | UW - HWc | UW - OW/OBd | HW - OW/OBe | ||||
Fruits self-efficacy (Cronbach’s alpha = 0.86) | ||||||||
12 | … eat 1 portion of fruit most times when you eat at a fast food place. | 1.51 (0.76) | 0.49 | |||||
11 | … eat 1 portion of fruit at a fast food place at least one time. | 1.55 (0.78) | 0.49 | −0.47** | −0.30* | 0.20* | 0.21* | |
10 | … eat 1 portion of fruit for dinner at home at least one time. | 1.84 (0.89) | 0.48 | −0.17* | 0.27* | |||
3 | …ask someone in your family to buy 3 fruit at least every week. | 2.02 (0.85) | 0.64 | |||||
4 | … eat 1 portion of fruit at lunch at least one time on a school day. | 2.06 (0.87) | 0.43 | |||||
6 | … eat 1 portion of fruit for lunch most non-school days, including weekends. | 2.09 (0.85) | 0.59 | |||||
2 | …ask someone in your family to buy 3 fruit at least one time. | 2.13 (0.83) | 0.59 | 0.18* | −0.19* | |||
1 | …ask someone in your family to buy your favorite fruit every week. | 2.14 (0.78) | 0.54 | 0.19* | ||||
5 | … eat 1 portion of fruit for lunch at least one time on a non-school day, including weekends. | 2.23 (0.84) | 0.59 | 0.19* | 0.18* | |||
8 | …eat 1 portion of fruit for a snack at home at least 4 days a week. | 2.24 (0.83) | 0.55 | 0.23* | ||||
9 | …ask someone in your family to serve 1 fruit instead of your usual dessert for dinner most nights. | 2.26 (0.83) | 0.52 | −0.16* | ||||
7 | … eat 1 portion of fruit for a snack at home at least one time. | 2.35 (0.79) | 0.55 | 0.36* | 0.25* | −0.32* | −0.25* | |
Vegetables self-efficacy (Cronbach’s alpha = 0.85) | ||||||||
6 | … eat 3 portions of vegetables at least 4 days a week, even when you are stressed. | 1.80 (0.83) | 0.61 | −0.20* | −0.20* | 0.48** | 0.45** | |
7 | … eat 1 portion of a vegetable most times when you eat at a fast food place. | 1.91 (0.84) | 0.56 | |||||
2 | …cut up 1 portion of a vegetable and eat it with a dip for a snack at least one time. | 1.91 (0.85) | 0.59 | 0.20* | 0.21* | |||
4 | … ask someone in your family to serve 2 vegetables for dinner most nights. | 1.94 (0.84) | 0.67 | −0.17* | −0.28* | |||
3 | … ask someone in your family to serve 2 vegetables for dinner at least one time. | 2.03 (0.85) | 0.68 | |||||
8 | … eat 1 portion of a vegetable most times when you eat at a cafeteria type restaurant. | 2.07 (0.85) | 0.55 | |||||
5 | …eat 3 portions of vegetables at least 4 days a week. | 2.18 (0.84) | 0.59 | 0.19* | 0.27* | 0.21* | ||
1 | …eat 1 portion of a vegetable at lunch at least one time on a school day. | 2.37 (0.80) | 0.45 | −0.46** | −0.44** | |||
Water self-efficacy (Cronbach’s alpha = 0. 79) | ||||||||
5 | ... drink 6 glasses or bottles of water for at least one day. | 2.21 (0.85) | 0.55 | 0.47** | 0.44** | |||
4 | …drink 6 glasses or bottles of water for at least 4 days a week. | 2.26 (0.80) | 0.65 | 0.19* | ||||
3 | … drink only water whenever you are thirsty for at least 4 days a week. | 2.26 (0.82) | 0.55 | −0.29* | ||||
1 | …drink only water whenever you are thirsty for at least one day. | 2.42 (0.77) | 0.43 | 0.25* | −0.39* | −0.38* | ||
2 | … drink 4 glasses or bottles of water for at least one day. | 2.48 (0.75) | 0.65 | 0.32* | ||||
Physical Activity self-efficacy (Cronbach’s alpha = 0.91) | ||||||||
11 | … be physically active more than 30 min for at least 4 days a week, even when the weather outside is bad. | 1.83 (0.82) | 0.70 | |||||
6 | … ask your friends to be physically active with you more than 30 min for at least 4 days a week. | 1.87 (0.85) | 0.69 | −0.21* | ||||
10 | … be physically active more than 30 min for at least 4 days a week when your friends want to do something else. | 1.90 (0.84) | 0.73 | −0.22* | −0.25* | |||
8 | … be physically active more than 30 min for one day, even when you have lots of other things to do. | 1.93 (0.84) | 0.74 | −0.26* | ||||
7 | … be physically active more than 30 min for one day, even when you have homework. | 1.94 (0.85) | 0.71 | |||||
9 | … be physically active more than 30 min for at least 4 days a week, even when you have lots of other things to do. | 1.98 (0.85) | 0.74 | −0.25* | ||||
4 | … the ability to play team sports like basketball, soccer or softball really well. | 2.05 (0.84) | 0.60 | −0.71*** | 0.28* | 0.38* | ||
5 | … ask your friends to be physically active with you more than 30 min for at least one day. | 2.20 (0.83) | 0.56 | 0.19* | 0.26* | 0.21* | ||
12 | … be physically active more than 30 min for most nonschool days, including weekends. | 2.26 (0.80) | 0.58 | |||||
2 | … the ability to do physical activities like running, dancing, bicycling, or jumping rope really well. | 2.24 (0.75) | 0.58 | 0.44** | −0.22* | −0.42* | −0.50** | |
3 | … the ability to play team sports like basketball, soccer or softball. | 2.29 (0.81) | 0.54 | −0.79*** | 0.27* | 0.31* | 0.54** | 0.23* |
1 | … the ability to do physical activities like running, dancing, bicycling, or jumping rope | 2.59 (0.65) | 0.40 | 0.79*** | 0.23* | −0.43* | −0.46** |