Table I.
Item Descriptive Information—Physical Activity Calibrated Scale
| Item stem | Wave 1 (N = 700) |
Wave 2 (N = 1057) |
||||||
|---|---|---|---|---|---|---|---|---|
| Mean | SD | Floor (%)a | Ceiling (%)a | Mean | SD | Floor (%)a | Ceiling (%)a | |
| How many days was your child so physically active that he/she sweated? | 2.83 | 1.28 | 21.00 | 10.71 | 3.39 | 1.22 | 11.64 | 19.58 |
| How many days did your child play so hard that he/she got physically exhausted? | 2.54 | 1.21 | 26.86 | 5.43 | 2.83 | 1.20 | 19.96 | 7.38 |
| How many days did your child play so hard that he/she fell asleep early? | 2.75 | 1.10 | 15.00 | 6.00 | 2.27 | 1.11 | 33.11 | 2.65 |
| How many days did your child play so hard that he/she needed an extra or longer nap? | 2.56 | 1.16 | 23.29 | 5.43 | 1.98 | 1.05 | 45.51 | 1.61 |
| How many days did your child play so hard that he/she felt tired? | 2.98 | 1.06 | 9.43 | 8.00 | 2.85 | 1.13 | 14.66 | 8.33 |
| How many days did your child do vigorous physical activities for 30 min or more?b | 3.16 | 1.36 | 16.43 | 21.71 | 3.00 | 1.32 | 20.34 | 13.91 |
| On a usual day, how physically active was your child?b | 4.22 | 0.84 | 0.86 | 42.86 | 3.88 | 0.84 | 1.23 | 22.80 |
Note. IRT = item response theory; SD = standard deviation.
a
Rating scale used: 1 = no days, 2 = 1 day, 3 = 2–3 days, 4 = 4–5 days, 5 = 6–7 days. “Floor” referred to percentage of participants who endorsed “no days”; “ceiling” referred to percentage of participants who endorsed “6–7 days.”
b
Items were not calibrated together with the rest of items using IRT, but they were included in the Physical Activity calibrated scale.