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Table 1 Prescription characteristics of the three clusters

From: Custom-made foot orthoses: an analysis of prescription characteristics from an Australian commercial orthotic laboratory

  Cluster 1 (n = 224) Cluster 2 (n = 540) Cluster 3 (n = 236) p
Orthosis type
 Traditionala 119 (56.1) 291 (55.5) 83 (35.2) <0.001
 Concave wedgea 82 (38.7) 211 (40.3) 127 (55.0) <0.001
 Wedge 3 (1.4) 2 (0.4) 5 (2.2) 0.068
 Court (hook) 3 (1.4) 12 (2.3) 1 (0.4) 0.174
 Court (full)a 5 (2.4) 8 (1.5) 15 (6.5) 0.001
Cast correction in degrees – rearfootb
 -11 to 2a 56 (25.0) 187 (34.6) 0 (0.0) <0.001
 3 to 5a 68 (30.4) 224 (41.5) 0 (0.0) <0.001
 6 to 9a 71 (31.7) 129 (23.9) 5 (2.1) <0.001
 10 to 35a 29 (12.9) 0 (0.0) 231 (97.9) <0.001
Cast correction in degrees – forefootc
 -10 to -1a 10 (4.5) 46 (8.5) 7 (3.0) 0.006
 0a 194 (21.7) 478 (88.5) 223 (94.5) 0.012
 1 to 30a 20 (8.9) 16 (3.0) 6 (2.5) <0.001
Arch fill technique
 Modified Roota 31 (14.0) 65 (12.2) 5 (2.1) <0.001
 Mida 109 (49.1) 334 (62.9) 29 (12.3) <0.001
 Mid-modified Roota 56 (25.2) 89 (16.8) 23 (9.7) <0.001
 Inverteda 2 (0.9) 3 (0.3) 50 (5.1) <0.001
 Inverted-mida 12 (5.4) 24 (4.5) 116 (49.2) <0.001
 Inverted-modified Roota 1 (0.5) 0 (0.0) 8 (3.4) <0.001
 Inverted mid-modified Roota 1 (0.5) 0 (0.0) 4 (1.7) 0.011
Arch fill – optional
 Minimum 48 (21.6) 94 (17.5) 38 (16.1) 0.272
 Standard 168 (75.7) 417 (77.8) 186 (78.8) 0.389
 Maximum 6 (2.7) 25 (4.7) 12 (5.1) 0.710
Cast modifications
 Medial heel skivea 22 (9.8) 72 (13.3) 9 (3.8) <0.001
 Lateral heel skivea 4 (1.8) 8 (1.5) 2 (0.8) 0.674
 Triplanar heel shavea 3 (1.3) 19 (3.5) 1 (0.4) 0.017
 No plaster fill between 1-5a 32 (14.3) 60 (11.1) 10 (4.2) <0.001
 Cuboid notcha 66 (29.5) 174 (32.2) 94 (39.8) 0.043
 Plantar 5th ray grind 34 (15.2) 114 (21.1) 56 (23.7) 0.063
 Plantar fascial accommodationa 95 (42.4) 174 (32.2) 82 (34.7) 0.027
 1st ray accommodation 39 (17.4) 119 (22.0) 53 (22.5) 0.305
 Heel expansion 15 (6.7) 17 (3.1) 13 (5.5) 0.068
 Medial flarea 33 (14.7) 50 (9.3) 59 (25.0) <0.001
 Medial wrap 6 (2.7) 6 (1.1) 3 (1.3) 0.254
Shell material
 Polypropylene 202 (92.2) 489 (91.6) 222 (94.9) 0.246
 Carbon fibre / TL2100 1 (0.5) 3 (0.6) 0 (0.0) 0.525
 EVA 16 (7.3) 43 (8.1) 12 (5.1) 0.355
Shell modifications
 Heel aperture 26 (11.6) 47 (8.7) 18 (7.6) 0.298
 1st ray cut-out 14 (6.3) 35 (6.5) 12 (5.1) 0.752
 Lateral plantar grinda 4 (1.8) 9 (1.7) 26 (11.0) <0.001
 Gait plate 3 (1.3) 5 (0.9) 3 (0.3) 0.847
 Low profile shella 31 (13.9) 80 (14.8) 60 (25.4) 0.002
 Heel stabilisera 167 (74.6) 372 (68.9) 194 (82.2) <0.001
Cover shape
 No cover – polisheda 1 (0.6) 20 (4.2) 4 (2.1) 0.041
 No cover – rough 3 (1.8) 15 (3.2) 8 (4.2) 0.400
 Standarda 3 (1.8) 75 (15.9) 27 (14.3) <0.001
 Standard plusb 5 (2.9) 53 (11.2) 16 (9.5) 0.005
 Web 10 (5.8) 55 (11.6) 18 (9.5) 0.094
 Fullb 149 (87.1) 255 (53.9) 116 (61.4) <0.001
  1. asignificant difference between clusters according to chi-square analysis
  2. bvariable divided into quartiles for analysis
  3. c variable divided into tertiles for analysis
  4. Values are n (%)