Table 9 Characteristics of treatment considered most important by the respondents (significant differences in bold)

Country/Answer

A. Acceptable price

B. Aesthetics of the appliance

C. Invisibility of the appliance

D. Treatment time

E. Expected excellent result

Chile

475 (70,9%)

311 (46,4%)

230 (34,3%)

404 (60,3%)

419 (62,5%)

Poland

283 (67,1%)

180 (42,7%)

100 (23,7%)

224 (53,1%)

305 (72,3%)

Sum

758 (69,4%)

491 (45,0%)

330 (30,2%)

628 (57,5%)

724 (66,3%)

Difference CL/PL

0.204

0.248

< 0.001

0.022

0.001

Country/Answer

F. Partial improvement in tooth alignment

G. Virtual prognosis and visualization of the treatment result

H. No need for cooperation in wearing, changing appliance

I. No dietary restrictions

J. No speech disorders

Chile

201 (30%)

97 (14,5%)

64 (9,6%)

121 (18,1%)

233 (34,8%)

Poland

85 (20,1%)

62 (14,7%)

28 (6,6%)

165 (39,0%)

209 (49,5%)

Sum

286 (26,2%)

159 (14,6%)

92 (8,4%)

286 (26,2%)

442 (38,6%)

Difference CL/PL

< 0.001

0.992

0.115

< 0.001

< 0.001

Country/Answer

K. no irritation of the oral mucosa

L. Brand recognition

M. Short treatment time

N. No grinding (stripping) of teeth

O. No pain

Chile

202 (30,1%)

32 (4,8%)

190 (28,4%)

256 (38,2%)

219 (32,7%)

Poland

191 (45,3%)

7 (1,7%)

111 (26,3%)

110 (26,1%)

157 (37,2%)

Sum

393 (36,0%)

39 (36%)

301 (27,6%)

366 (33,5%)

376 (34,4%)

Difference CL/PL

< 0.001

0.011

0.503

< 0.001

0.143