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Table 3 Pre- and post-intervention outcomes for ActiGraph accelerometer and Exercise Vital Sign measured physical activity

From: Print versus a culturally-relevant Facebook and text message delivered intervention to promote physical activity in African American women: a randomized pilot trial

  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   
  1. 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).
  2. All reported physical activity values are in in minutes/week and are rounded to the nearest integer.
  3. actm = counts per minute.
  4. bWilcoxon signed rank P for within group baseline to 8 week change.
  5. cBetween group differences in baseline to 8-week physical activity changes calculated using ANCOVAs and adjusted for baseline physical activity levels.
  6. dEta squared effect size estimates for ANCOVA models controlling from baseline physical activity levels.