Physical activity data in extremely preterm and control children
| Extremely preterm (EP) n =31 | Control n=30 | Mean Difference (95% CI) (EP–control) | p Value | |
| Accelerometer | ||||
| Duration of daily recording (min) | 735 (709–756) | 743 (704–764) | −8 (−35 to 19) | 0.57 |
| Days of valid recording (days) | 6.0 (5.0–6.0) | 6.0 (5.0–6.3) | 0 (−0.6 to 1.0) | 0.67 |
| Activity counts/min (counts/min) | 478 (417–542) | 503 (459–623) | 45 (−150 to 59) | 0.38 |
| MVPA (min/day) | 9.0 (4.3–11.9) | 11.0 (7.0; 17.5) | −2 (−11.5 to 1.4) | 0.12 |
| Exercise perception questionnaire | ||||
| Q1 Compared with your friends, how easy do you find physical activity? (0 cm: very difficult, 10 cm: very easy) | 6.7 (5.8–7.6) | 8.4 (7.3–9.5) | −1.7 (−3.1 to −0.3) | 0.01 |
| Q2 When exercising, do you find it difficult to breathe?(0 cm: very difficult, 10 cm: not at all) | 5.7 (4.5–6.9) | 7.9 (6.6–9.3) | −2.2 (−4.0 to −0.5) | 0.01 |
| Q3 When exercising, do you notice that you have a cough? (0 cm: all the time, 10 cm: never) | 8.2 (7.3–9.2) | 9.0 (8.3–9.8) | −0.8 (−2.1 to 0.6) | 0.24 |
| Q4 When exercising, do you feel wheezy or have tightness in your chest? (0 cm: all the time, 10 cm: never) | 6.8 (5.4–8.0) | 7.8 (6.4–9.3) | −1.0 (−3.0 to 0.9) | 0.28 |
| Q5 How long can you exercise for without feeling uncomfortable or needing to stop to rest? (0 cm: <5 min, 10 cm: >30 min) | 6.4 (5.3–7.6) | 7.9 (6.4–9.4) | 1.5 (−3.3 to 0.4) | 0.11 |
Data presented as median (IQR) and log transformed prior to comparison.
Responses to exercise perception questions were completed on a 10 cm visual-analogue scale, with 0 cm representing the worst outcome and 10 cm the best outcome.
MVPA, moderate to vigorous physical activity.