Table 3 Intra-class correlation coefficients for all scales and outcomes by each reporting group

Electronics in the home and bedroom

TVs

.96

.91

.87

.93

VCR/DVD player

.83

.60

.81

.75

Digital TV recorder

.26

.55

.39

.36

Music Player

.55

.38

.58

.64

Desktop computer with internet

.75

.76

.59

.72

Desktop computer without internet

.61

.59

.51

.50

Video game player

.87

.83

.78

.83

Telephone

.91

.82

.84

.80

Electronics in the Home Scale

.92

.71

.87

.82

Electronics in the Bedroom Scale

.90

.67

.88

.74

Portable electronics

Music player

.59

.54

.38

.61

Handheld videogame player

.51

.63

.76

.74

Computer with internet access

.61

.59

.54

.59

Computer without internet

.37

.46

.58

.54

Cell phone

.67

.55

.64

.49

Portable Electronics Scale

.71

.56

.60

.63

Physical activity equipment

Bikes

.85

.73

.78

.64

Basketball

.66

.76

.56

.70

Jump rope

.71

.72

.54

.45

Sports equip

.65

.50

.63

.44

Swimming pool

.53

.58

.48

.56

Roller skates

.74

.54

.51

.57

Fixed play equipment

.73

.50

.55

.49

Aerobic equip

.71

.70

.60

.68

Weight lifting

.58

.63

.59

.53

Water/snow equip

.67

.55

.62

.54

Yoga/exercise mat

.67

.54

.61

.52

Exercise, play, recreation room

.53

.66

.54

.51

Trampoline

.84

.62

.65

.59

Stairs

.84

.73

.54

.69

Physical Activity Equipment Scale

.80

.54

.69

.63

Behavioral Outcomes

TV time

.67

.70

.63

.57

Sedentary Composite Score

.53

.62

.67

.54

Physical activity frequency

.65

.57

.63

.55