|Item description and estimates of DIF where significant|
|Mean (SD)||CITC||Difficulty differences|
|Low edu.-High edu.a||English-Spanishb||3-5 yo -5-8 yoc||3-5 yo-9-12 yod||5-8 yo -9-12 yoe|
|Social Co-viewing (Cronbach’s alpha = 0.83)|
|1||How often do you watch TV together because you both like a program?||3.42 (0.67)||0.68|
|5||How often do you watch your favorite program together?||3.35 (0.74)||0.7||0.3*||-0.41*||-0.37*|
|6||How often do you laugh with your child about the things you see on TV?||3.67 (0.54)||0.62||0.35*|
|12||How often do you watch TV together because of a common interest in a program?||3.41 (0.67)||0.67||0.34*|
|14||How often do you watch TV together just for fun?||3.35 (0.67)||0.51|
|Instructive Mediation (Cronbach’s alpha = 0.83)|
|2||How often do you explain what something on TV really means?||3.47 (0.63)||0.54||0.67***||-0.6**||0.88***||1.15***|
|4||How often do you try to help your child understand what she/he sees on TV?||3.53 (0.66)||0.58||-0.4*|
|8||How often do you point out why some things actors do are bad?||3.53 (0.74)||0.65||0.34*||0.5**|
|10||How often do you point out why some things actors do are good?||3.44 (0.74)||0.69|
|13||How often do you explain the motives of TV characters?||3.19 (0.77)||0.7|
|Restrictive (Cronbach’s alpha = 0.72)|
|3||How often do you specify in advance the programs that may be watched?||3.47 (0.76)||0.41||0.41*||-0.36*|
|7||How often do you set specific viewing hours for your child?||3.16 (0.96)||0.49||-0.33*||-0.24*|
|9||How often do you tell your child to turn off the TV when he/she is watching an unsuitable program?||3.65 (0.74)||0.42||0.25*|
|11||How often do you restrict the amount of TV your child can watch?||3.39 (0.78)||0.56||-0.46**||-0.3*|
|15||How often do you forbid your child to watch certain programs?||3.51 (0.72)||0.54|
Note.*small effect (difference < 0.426); **moderate effect (0.426 < difference < 0.638); ***large effect (difference > 0.638).
aPositive numbers, easier for high education; Negative value, easier for low education; bPositive numbers, easier for Spanish; Negative value, easier for English.
cPositive numbers, easier for 5–8 years old; Negative value, easier for 3–5 years old; dPositive numbers, easier for 9–12 years old; eNegative value, easier for 3–5 years old.
Chen et al.
Chen et al. International Journal of Behavioral Nutrition and Physical Activity 2013 10:41 doi:10.1186/1479-5868-10-41