Table 4.
Longitudinal changes in activity duration between 11y and 13y, overall sample and clusters, LSAC data
| Activity | ANALYTIC SAMPLE (n = 1043) | SEGMENT 1 (n = 143) (‘Social Screens’) |
SEGMENT 2 (n = 900) (‘The Mainstream’) |
|||
|---|---|---|---|---|---|---|
| Mean change (95% CI) (min/day) | Effect size (d) | Mean change (95% CI) (min/day) | Effect size (d) | Mean change (95% CI) (min/day) | Effect size (d) | |
| Non-organized PA | −87.0 (−91.4, −82.5)*** | −1.19 | −88.4 (−101.1, −75.8)*** | −1.16 | −86.7 (−91.5, −82.0)*** | − 1.20 |
| Texting/emailing/social media | 8.7 (6.6, 10.8)*** | 0.26 | 56.4 (44.3, 68.6)*** | 0.77 | 1.1 (0.6, 1.6)*** | 0.16 |
| Other internet use | 4.6 (2.8, 6.4)*** | 0.15 | 32.2 (20.1, 44.2)*** | 0.44 | 0.2 (−0.3, 0.7) | 0.03 |
| Other PAa | 15.4 (9.6, 21.2)*** | 0.16 | 12.0 (−1.6, 25.6) | 0.15 | 16.0 (9.6, 22.4)*** | 0.16 |
| Reading for leisure | −3.2 (−6.5, 0.0) | − 0.06 | −1.0 (− 10.1, 8.1) | − 0.02 | −3.6 (−7.1, − 0.1)* | − 0.07 |
| Watching TV/movies | 2.9 (−4.7, 10.6) | 0.02 | − 18.0 (− 38.0, 2.0) | − 0.15 | 6.3 (−2.0, 14.5) | 0.05 |
| Shopping | 0.2 (−2.3, 2.6) | 0.00 | 2.9 (−5.2, 11.0) | 0.06 | −0.3 (− 2.8, 2.3) | − 0.01 |
| Music for leisure | 0.8 (− 1.5, 3.1) | 0.02 | −3.5 (− 12.5, 5.5) | − 0.06 | 1.5 (− 0.8, 3.7) | 0.04 |
| Electronic gaming | 2.5 (− 3.0, 8.0) | 0.03 | − 24.4 (− 43.3, − 5.4)* | − 0.21 | 6.7 (1.2, 12.3)* | 0.08 |
| Homework/study | 8.8 (5.0, 12.5)*** | 0.14 | 4.3 (− 5.9, 14.4) | 0.07 | 9.5 (5.5, 13.4)*** | 0.16 |
| School lessons | 9.0 (4.6, 13.4)*** | 0.12 | 9.2 (−0.5, 18.9) | 0.16 | 9.0 (4.1, 13.8)*** | 0.12 |
| Sleeping/napping | −5.6 (−11.7, 0.4) | −0.06 | −15.5 (−33.5, 2.5) | − 0.14 | −4.0 (− 10.4, 2.4) | −0.04 |
| Daily living activities | 11.9 (5.6, 18.2)*** | 0.12 | 16.9 (0.3, 33.6)* | 0.17 | 11.1 (4.3, 17.9)** | 0.11 |
| Verbal communication | 15.4 (11.7, 19.0)*** | 0.25 | 17.6 (8.0, 27.2)*** | 0.30 | 15.0 (11.1, 19.0)*** | 0.25 |
n number of participants, CI confidence interval
Bold text indicates statistically significant differences: *p < 0.05 **p < 0.01 ***p < 0.001 (paired-samples t-tests)
a.Among the analytic sample, other PA increased from 46.6 min/day at 11 years (95% CI = 43.1, 50.2) to 62.1 min/day at 13 years (95% CI = 57.3, 66.9). This increase was spread fairly uniformly across organized PA (+ 5.2 min/day, 95% CI = 0.8, 9.7), active transport (+ 5.0 min/day, 95% CI = 2.5, 7.6) and active chores/work (+ 5.2 min/day, 95% CI = 2.3, 8.1).