Table 1: Normative orthodontic treatment need assessed with the IOTN-AC, DAI, ICON, and PAR.

No definite treatment needDefinite treatment need

IOTN-AC89.1% (n = 594)10.9% (n = 73)
IOTN-DHC52.2% (n = 348)47.8% (n = 319)
DAI69.4% (n = 463)30.6% (n = 204)
ICON62.1% (n = 414)37.9% (n = 253)
PAR88.6% (n = 591)11.4% (n = 76)

Definite treatment need: IOTN-AC: categories 8-10, IOTN-DHC: categories 4 and 5, DAI: score 36, ICON: >42, PAR: initial score 25.