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
| Â | 1 day | 2 days | 3 days | 4 days | 5 days | 6 days | 7-8 days | Â | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Hours | N | (%) | PA, cpm | N | (%) | PA, cpm | N | (%) | PA, cpm | N | (%) | PA, cpm | N | (%) | PA, cpm | N | (%) | PA, cpm | N | (%) | PA, cpm | Â |
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 | Â |
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 | Â |
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 | 90Â 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 | Â |
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 | Â |
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 | Â |
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 | Â |
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 | 60Â 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 | Â |
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 | Â |
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 | Â |
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 | Â |
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 | 30Â 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 | Â |
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 | Â |
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 | Â |
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 | Â |
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 | 20Â 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 | Â |
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 | Â |
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 | Â |
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 | Â |
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 | 10Â 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 | Â |
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 | Â |