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Table 1 Results from Classical Test Theory & Item Response Theory Analyses of the Physical Activity (PA) Self-Efficacy Scale (n = 586)

From: Development of new physical activity and sedentary behavior change self-efficacy questionnaires using item response modeling

Item How sure are you that you have (can)...

M (SD)

CITC

Factor

Infit

Est (SE)

229

x

...the ability to do other physical activities like running, dancing, bicycling, or jumping rope?

0.85 (0.35)

0.41

0.63

1.01

-1.50 (0.09)

227

x

...the ability to play team sports like basketball, soccer or softball?

0.82 (0.38)

0.41

0.61

1.02

-1.11 (0.09)

208

 

... be PA ≥ 30 minutes one day after school?

0.81 (0.39)

0.44

0.64

1.02

-1.00 (0.09)

230

x

...the ability to do other PA like running, dancing, bicycling, or jumping rope really well?

0.80 (0.40)

0.42

0.60

1.06

-0.99 (0.38)

224

 

...be PA (playing sports or games) ≥ 30 minutes one day on a non-school day, including the weekend?

0.79 (0.41)

0.42

0.60

1.06

-0.90 (0.09)

225

x

...be PA(playing sports or games) ≥ 30 minutes most non-school days, including weekend?

0.77 (0.42)

0.51

0.71

0.99

-0.73 (0.09)

209

 

... be PA ≥ 30 minutes at least 4 days a week after school?

0.76 (0.43)

0.49

0.68

0.97

-0.65 (0.08)

222

x

...ask your friends to be PA with you ≥ 30 minutes one day?

0.74 (0.44)

0.41

0.57

1.13

-0.51 (0.08)

228

x

...the ability to play team sports like basketball, soccer or softball really well?

0.71 (0.45)

0.50

0.69

1.02

-0.27 (0.08)

214

x

... be PA ≥ 30 minutes one day, even when you have homework?

0.67 (0.47)

0.45

0.60

1.07

-0.01 (0.08)

210

 

... be PA ≥ 30 minutes one day when your friends want to do something else?

0.67 (0.47)

0.50

0.66

1.03

0.01 (0.08)

223

x

...ask your friends to be PA with you ≥ 30 minutes at least 4 days a week?

0.64 (0.48)

0.46

0.61

1.08

0.19 (0.08)

216

 

... be PA ≥ 30 minutes one day, even when you have to stay inside the house?

0.64 (0.48)

0.48

0.63

1.06

0.24 (0.08)

226

 

...be PA(playing sports/games) ≥ 30 minutes most non-school days, including weekend, even if stressed?

0.63 (0.48)

0.51

0.67

1.05

0.31 (0.08)

212

 

... be PA ≥ 30 minutes one day when the weather outside is bad (for example, rainy, hot, or cold)?

0.60 (0.49)

0.53

0.69

0.99

0.41 (0.08)

211

x

... be PA ≥ 30 minutes at least 4 days a week when your friends want to do something else?

0.59 (0.49)

0.56

0.73

0.93

0.46 (0.08)

220

 

... be PA ≥ 30 minutes one day, even when you are tired?

0.58 (0.49)

0.57

0.73

0.99

0.55 (0.08)

218

x

... be PA ≥ 30 minutes one day, even when you have lots of other things to do?

0.56 (0.50)

0.49

0.63

1.02

0.65 (0.08)

215

 

... be PA ≥ 30 minutes at least 4 days a week, even when you have homework all month?

0.55 (0.50)

0.52

0.67

0.98

0.74 (0.08)

217

 

... be PA ≥ 30 minutes at least 4 days a week, even when you have to stay inside the house all month?

0.53 (0.50)

0.52

0.67

1.01

0.85 (0.08)

213

x

... be PA ≥ 30 minutes at least 4 days a week when weather outside is bad?

0.52 (0.50)

0.52

0.67

1.00

0.91 (0.08)

221

 

... be PA ≥ 30 minutes at least 4 days a week, even when you are tired?

0.48 (0.50)

0.57

0.73

0.91

1.17 (0.08)

219

x

... be PA ≥ 30 minutes at least 4 days a week, even when you have lots of other things to do?

0.48 (0.50)

0.59

0.77

0.89

1.19 (0.08)

  1. % Variance Explained (Factor 1/Factor 2) (46.4%/8.5%) – Cronbach's alpha/Person-separation reliability (full scale 0.90/0.86; reduced scale 0.81, 0.78)
  2. Corrected item total correlation [CITC]; item response modeling item difficulty estimate & standard error [Est (SE)]; Infit statistic (acceptable range 0.75 – 1.33)
  3. Self efficacy item scale: not sure (0), sure (1); "x" represents item retained in reduced scale
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International Journal of Behavioral Nutrition and Physical Activity

ISSN: 1479-5868

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