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Table 2 Adolescents included in analysis in different data reduction criteria: Hours to define a valid day, number of valid days and non-wear time), N = 1296

From: Accelerometer data reduction in adolescents: effects on sample retention and bias

  1 day 2 days 3 days 4 days 5 days 6 days 7-8 days  
Hours N (%) PA, cpm N (%) PA, cpm N (%) PA, cpm N (%) PA, cpm N (%) PA, cpm N (%) PA, cpm N (%) PA, cpm  
6 1288 (99.4) 560.0 1282 (98.9) 560.7 1265 (97.6) 561.2 1249 (96.4) 561.5 1217 (93.9) 561.6 1157 (89.3) 558.9 1049 (80.9) 562.8  
8 1284 (99.1) 563.7 1275 (98.4) 564.2 1256 (96.9) 564.5 1234 (95.2) 565.0 1184 (91.4) 565.4 1103 (85.1) 563.3 947 (73.1) 567.9  
9 1282 (98.9) 566.3 1270 (98.0) 566.9 1251 (96.5) 567.0 1225 (94.5) 567.1 1171 (90.4) 567.5 1063 (82.0) 564.3 869 (67.1) 572.8 90 min non-wear
10 1281 (98.8) 569.3 1259 (97.1) 569.6 1239 (95.6) 570.1 1211 (93.4) 568.2 1134 (87.5) 569.8 999 (77.1) 569.4 772 (59.6) 572.7  
12 1267 (97.8) 572.3 1241 (95.8) 573.6 1205 (93.0) 571.0 1133 (87.4) 571.6 978 (75.5) 571.4 710 (54.8) 573.4 360 (27.8) 569.9  
6 1286 (99.2) 571.5 1279 (98.7) 572.3 1263 (97.5) 572.0 1247 (96.2) 571.5 1212 (93.5) 572.2 1150 (88.7) 567.2 1024 (79.0) 570.5  
8 1281 (98.8) 575.4 1273 (98.2) 575.2 1253 (96.7) 575.5 1231 (95.0) 575.4 1177 (90.8) 573.5 1087 (83.9) 572.2 921 (71.1) 575.6  
9 1279 (98.7) 577.1 1264 (97.5) 577.1 1247 (96.2) 577.3 1219 (94.1) 575.9 1159 (89.4) 574.8 1040 (80.2) 573.9 839 (64.7) 577.7 60 min non-wear
10 1277 (98.5) 579,1 1256 (96.9) 579.3 1234 (95.2) 578.6 1207 (93.1) 577.1 1128 (87.0) 576.3 980 (75.6) 575.9 741 (57.2) 575.4  
12 1263 (97.5) 580.1 1237 (95.4) 580.4 1191 (91.9) 577.5 1111 (85.7) 576.3 937 (72.3) 575.9 653 (50.4) 575.4 313 (24.2) 563.7  
6 1284 (99.1) 589.0 1277 (98.5) 589.1 1261 (97.3) 588.0 1244 (96.0) 587.6 1201 (92.7) 587.0 1137 (87.7) 582.7 998 (77.0) 581.5  
8 1278 (98.6) 591.3 1268 (97.8) 590.8 1249 (96.4) 590.5 1227 (94.7) 590.5 1169 (90.2) 588.4 1070 (82.6) 585.3 888 (68.5) 586.0  
9 1277 (98.5) 592.2 1260 (97.2) 592.1 1242 (95.8) 591.8 1213 (93.6) 590.8 1146 (88.4) 589.9 1016 (78.4) 585.6 811 (62.6) 587.2 30 min non-wear
10 1275 (98.4) 593.8 1252 (96.6) 593.4 1229 (94.8) 591.8 1192 (92.0) 591.1 1106 (85.3) 589.9 945 (72.9) 586.4 691 (53.3) 583.9  
12 1256 (96.9) 594.9 1230 (94.9) 593.6 1181 (91.1) 591.1 1070 (82.6) 589.7 872 (67.3) 587.6 569 (43.9) 576.0 238 (18.4) 569.3  
6 1282 (98.9) 600.6 1277 (98.5) 600.6 1259 (97.1) 599.5 1244 (96.0) 599.0 1199 (92.5) 598.2 1128 (87.0) 594.3 981 (75.7) 593.4  
8 1277 (98.5) 602.7 1265 (97.6) 601.5 1248 (96.3) 601.7 1224 (94.4) 601.2 1166 (90.0) 599.8 1058 (81.6) 596.7 870 (67.1) 596.3  
9 1276 (98.5) 604.2 1257 (97.0) 603.8 1239 (95.6) 603.4 1210 (93.4) 602.4 1137 (87.7) 601.1 996 (76.9) 598.8 772 (59.6) 600.6 20 min non-wear
10 1269 (97.9) 595.5 1252 (96.6) 595.1 1227 (94.7) 594.7 1186 (91.5) 593.0 1091 (84.2) 593.5 919 (70.9) 591.2 630 (48.6) 592.3  
12 1254 (96.8) 605.7 1222 (94.3) 604.2 1167 (90.0) 603.3 1036 (79.9) 603.3 806 (62.2) 596.7 502 (38.7) 592.6 182 (14.0) 591.6  
6 1281 (98.8) 633.2 1275 (98.4) 632.9 1257 (97.0) 631.1 1242 (95.8) 632.0 1194 (92.1) 630.4 1120 (86.4) 626.5 955 (73.7) 627.3  
8 1275 (98.4) 636.5 1261 (97.3) 634.8 1244 (96.0) 634.9 1214 (93.7) 634.2 1150 (88.7) 632.6 1025 (79.1) 630.5 816 (63.0) 634.5  
9 1270 (98.0) 637.2 1253 (96.7) 635.7 1231 (95.0) 635.5 1193 (92.1) 633.5 1103 (85.1) 634.1 947 (73.1) 634.7 682 (52.6) 640.1 10 min non-wear
10 1267 (97.8) 638.6 1244 (96.0) 638.5 1211 (93.4) 636.1 1154 (89.0) 637.0 1035 (79.9) 641.0 819 (63.2) 638.7 473 (36.5) 639.8  
12 1224 (94.4) 641.4 1179 (91.0) 643.4 1070 (82.6) 647.1 884 (68.2) 645.9 597 (46.1) 642.9 286 (22.1) 647.7 85 (6.6) 667.7  
  1. Data reduction criteria used: 30 sec epoch, 24 hour duration, allow 2 activity epochs in blocks of non-wear.
  2. Presented as Number (%) and with the corresponding average physical activity (PA) counts (mean counts per minutes).