Table 1 Characteristics of the birth parameters and of the examined deciduous teeth of the boys aged 5–10 years (N = 56). In the study, one tooth came from one child.
From: Disturbances in primary dental enamel in Polish autistic children
Total of boys n = 56 | Autistic boys n = 22 | Healthy boys n = 34 | Difference between autistic and healthy boys* | |
|---|---|---|---|---|
Birth parameters Median | ||||
Gestational age (weeks) | 39 | 39.5 | 39 | Z = 0.42; p = 0.675 |
Birth weight (g) | 3,400 | 3,430 | 3,400 | Z = 0.64; p = 0.523 |
Body length (cm) | 55 | 55 | 55 | Z = 0.88; p = 0.378 |
Primary teeth n (%) | ||||
Incisors | 42 (75.0) | 17 (77.3) | 25 (73.5) | |
Molars | 14 (25.0) | 5 (22.7) | 9 (26.5) | |
Number of accentuated lines n (%) | ||||
0 | 34 (60.7) | 7 (31.8) | 27 (79.4) | |
1 | 8 (14.3) | 6 (27.3) | 2 (5.9) | |
2 | 8 (14.3) | 4 (18.2) | 4 (11.8) | |
3 | 4 (7.1) | 3 (13.6) | 1 (2.9) | |
4 | 2 (3.6) | 2 (9.1) | 0 (0.0) | |
Mean (SD) | 0.79 (1.16) | 1.41 (1.33) | 0.38 (0.82) | |
Median | 0 | 1 | 0 | Z = 3.03; p = 0.002 |
Neonatal line (µm) | ||||
n | 56 | 22 | 34 | |
Mean (SD) | 14.13 (3.77) | 13.98 (3.33) | 14.24 (4.07) | |
Median | 13.64 | 13.80 | 13.40 | Z = 0.05; p = 0.960 |
Periodicity of striae of Retzius (days) | ||||
n | 21 | 9 | 12 | |
Mean (SD) | 10.23 (1.27) | 9.75 (1.13) | 10.59 (1.29) | |
Median | 9.64 | 10.15 | 10.91 | Z = 1.35; p = 0.177 |
