Table 3.
Pre- and post-intervention outcomes for ActiGraph accelerometer and Exercise Vital Sign measured physical activity
| Baseline | 8-weeks | Statistical tests | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Variable | M (SD) | Median (min, max) | 25th & 75th percentiles | M (SD) | Median (Range) | 25th & 75th Percentiles | Baseline to 8-week change | Unadjusted within group baseline to 8-week change | Adjusted between group difference in baseline to 8-week change | Effect sized |
| Mean (SD) | P b | P c | η 2 | |||||||
| Accelerometer outcomes | ||||||||||
| Sedentary (0 – 99 ctm a ) | ||||||||||
| Facebook (n = 13) | 7811 (547) | 7591 (6598, 8444) | 7613, 8229 | 7740 (545) | 7605 (6946, 8592) | 7403, 8333 | −71 (379) | .542 | .026 | .251 |
| Print (n = 15) | 7797 (549) | 7887 (6578, 8498) | 7499, 8330 | 7916 (628) | 8046 (6746, 8882) | 7576, 8399 | 118 (753) | .639 | ||
| Light activity (100–759 ctm) | ||||||||||
| Facebook (n = 13) | 1218 (345) | 1061 (843, 1969) | 972, 1410 | 1313 (319) | 1259 (756, 1803) | 1008, 1596 | 95 (210) | .146 | .024 | .263 |
| Print (n = 15) | 1175 (268.) | 1193 (834, 1683) | 878, 1381 | 1234 (312) | 1225 (743, 2010) | 962, 1418 | 59 (401) | .421 | ||
| Moderate-lifestyle (760–1951 ctm) | ||||||||||
| Facebook (n = 13) | 461 (220) | 418.0 (198, 824) | 216, 713 | 489 (195) | 515 (125, 730) | 336, 665 | 27 (112) | .558 | .001 | .419 |
| Print (n = 15) | 463 (242) | 382 (197, 1076) | 314, 556 | 429 (178) | 356 (159, 744) | 273, 556 | −34 (248) | .901 | ||
| Moderate activity (1952–5725 ctm) | ||||||||||
| Facebook (n = 13) | 122 (67) | 133 (26, 252) | 61, 180 | 113 (63) | 109 (24, 220) | 59, 164 | −9 (78) | .635 | .422 | .069 |
| Print (n = 15) | 132 (99) | 120 (10, 332) | 57, 201 | 135 (125) | 98 (7, 502) | 58, 195 | 0 (82) | .773 | ||
| Vigorous activity (>5725 ctm) | ||||||||||
| Facebook (n = 13) | 2 (5) | 0 (0, 19) | 0, 0 | 12 (3) | 0 (0, 12) | 0, 2 | -.31 (7) | .906 | n/a | .459 |
| Print (n = 15) | 8 (11) | 0 (0, 34) | 0, 11 | 4 (10) | 0 (0, 38) | 0, 3 | −4 (12) | .438 | ||
| Total moderate-to-vigorous activity (>1951 ctm) | ||||||||||
| Facebook (n = 13) | 123 (69) | 137 (23, 252) | 61, 180 | 116 (64) | 112 (24, 220) | 596, 165 | −9 (78) | .735 | .327 | .089 |
| Print (n = 15) | 140 (107) | 120 (10, 343) | 63, 225 | 139 (129) | 98 (7, 513) | 61, 195 | −1 (87) | .890 | ||
| Moderate-to-vigorous activity in 10 minutes bouts or greater (>1951 ctm) | ||||||||||
| Facebook (n = 13) | 22 (27) | 10 (0, 85) | 0, 40 | 26 (35) | 11 (0, 106) | 0, 41 | 4 (45) | .910 | .637 | .036 |
| Print (n = 15) | 33 (44) | 12 (0, 121) | 0, 40 | 36 (72) | 0 (0, 258) | 0, 68 | 3 (57) | .831 | ||
| Exercise vital sign c (minutes/week) | ||||||||||
| Facebook (n = 14) | 91 (120) | 60 (0, 450) | 18, 98 | 153 (120) | 110 (20, 450) | 75, 217 | 62 (169) | .025 | .015 | .483 |
| Print (n = 15) | 101 (90) | 90 (10, 360) | 30, 120 | 108 (1445) | 90 (0, 600) | 40, 100 | 7 (194) | .801 | ||
Facebook = Facebook and text message intervention (n = 13 for accelerometer outcomes because one participant did not provide valid wear time for analysis at 8-weeks); Print = Print-based intervention (n = 15 for accelerometer outcomes).
All reported physical activity values are in in minutes/week and are rounded to the nearest integer.
actm = counts per minute.
bWilcoxon signed rank P for within group baseline to 8 week change.
cBetween group differences in baseline to 8-week physical activity changes calculated using ANCOVAs and adjusted for baseline physical activity levels.
dEta squared effect size estimates for ANCOVA models controlling from baseline physical activity levels.