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Table 2 The number of participants by gender and school grades in each population density subgroup

From: Lower youth steps/day values observed at both high and low population density areas: a cross-sectional study in metropolitan Tokyo

  Total Population density
Lowest Lower Middle Higher Highest
Boys
 Elementary school
  Low grade 2218 227 (10.2) 90 (4.1) 440 (19.8) 219 (9.9) 1242 (56.0)
  1st, 6–7 y.o.a 760 76 (10.0) 29 (3.8) 160 (21.1) 79 (10.4) 416 (54.7)
  2nd, 7–8 y.o. 737 73 (9.9) 32 (4.3) 145 (19.7) 74 (10.0) 413 (56.0)
  3rd, 8–9 y.o. 721 78 (10.8) 29 (4.0) 135 (18.7) 66 (9.2) 413 (57.3)
  High grade 2355 232 (9.9) 146 (6.2) 517 (22.0) 231 (9.8) 1229 (52.2)
  4th, 9–10 y.o. 788 80 (10.2) 45 (5.7) 162 (20.6) 83 (10.5) 418 (53.0)
  5th, 10–11 y.o. 756 71 (9.4) 43 (5.7) 174 (23.0) 76 (10.1) 392 (51.9)
  6th, 11–12 y.o. 811 81 (10.0) 58 (7.2) 181 (22.3) 72 (8.9) 419 (51.7)
 Junior high school
  All grade 2327 260 (11.2) 120 (5.2) 467 (20.1) 234 (10.1) 1246 (53.5)
  1st, 12–13 y.o. 820 79 (9.6) 40 (4.9) 171 (20.9) 74 (9.0) 456 (55.6)
  2nd, 13–14 y.o. 749 96 (12.8) 33 (4.4) 166 (22.2) 71 (9.5) 383 (51.1)
  3rd, 14–15 y.o. 758 85 (11.2) 47 (6.2) 130 (17.2) 89 (11.7) 407 (53.7)
Total 6900 719 (10.4) 356 (5.2) 1424 (20.6) 684 (9.9) 3717 (53.9)
Girls
 Elementary school
  Low grade 2253 208 (9.2) 109 (4.8) 481 (21.3) 210 (9.3) 1245 (55.3)
  1st, 6–7 y.o. 733 55 (7.5) 32 (4.4) 156 (21.3) 68 (9.3) 422 (57.6)
  2nd, 7–8 y.o. 756 59 (7.8) 36 (4.8) 169 (22.4) 75 (9.9) 417 (55.2)
  3rd, 8–9 y.o. 764 94 (12.3) 41 (5.4) 156 (20.4) 67 (8.8) 406 (53.1)
  High grade 2285 215 (9.4) 130 (5.7) 526 (23.0) 214 (9.4) 1200 (52.5)
  4th, 9–10 y.o. 746 79 (10.6) 33 (4.4) 165 (22.1) 75 (10.1) 394 (52.8)
  5th, 10–11 y.o. 771 64 (8.3) 42 (5.4) 177 (23.0) 69 (8.9) 419 (54.3)
  6th, 11–12 y.o. 768 72 (9.4) 55 (7.2) 184 (24.0) 70 (9.1) 387 (50.4)
 Junior high school
  All grade 2250 247 (11.0) 125 (5.6) 522 (23.2) 211 (9.4) 1145 (50.9)
  1st, 12–13 y.o. 782 88 (11.3) 38 (4.9) 184 (23.5) 68 (8.7) 404 (51.7)
  2nd, 13–14 y.o. 703 82 (11.7) 42 (6.0) 163 (23.2) 64 (9.1) 352 (50.1)
  3rd, 14–15 y.o. 765 77 (10.1) 45 (5.9) 175 (22.9) 79 (10.3) 389 (50.8)
Total 6788 670 (9.9) 364 (5.4) 1529 (22.5) 635 (9.4) 3590 (52.9)
  1. Data were presented as frequency (percentage)
  2. ay.o.; years old