Dental and health characteristics of 37 patients with recessive lower incisor hypodontia (RIH)
| Clinical characteristics | Girls +/N | (%) | Boys +/N | (%) |
| Four missing lower incisors | ||||
| Permanent | 1/18 | 6 | 8/19 | 42 |
| Deciduous | 2/19 | 10 | — | |
| Three missing lower incisors | ||||
| Permanent | 2/14 | 14 | 2/19 | 11 |
| Deciduous | 1/14 | 7 | — | |
| Peg shaped incisor(s) | ||||
| Permanent | 7/18 | 39 | 5/18 | 28 |
| Deciduous | 7/12 | 58 | 6/10 | 60 |
| Missing permanent canine(s) | 1/12 | 8 | 4/16 | 25 |
| Missing premolar(s) | 8/17 | 47 | 7/16 | 43 |
| Missing first or second molars | ||||
| Permanent | 1/16 | 6 | 6/16 | 38 |
| Deciduous | 1/10 | 10 | — | |
| Taurodontism in permanent molars | 5/10 | 50 | 11/16 | 69 |
| Dental age >2 SD | 4/12 | 33 | 5/16 | 31 |
| Asthma, diagnosed by a doctor | 7/18 | 39 | 9/19 | 47 |
| Atopic skin, diagnosed by a doctor | 11/17 | 62 | 9/17 | 53 |