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Table 2 Percentage distribution of knowledge scores of GDPs, pediatric dentists and other dental specialists for each question regarding MIH knowledge

From: Knowledge, perception, and clinical experiences on molar incisor hypomineralization amongst Portuguese dentists

Questions Total
N = 257
N (%)
GDPs
N = 130
N (%)
PDs
N = 24
N (%)
ODSs
N = 103
N (%)
p-value
It is known that MIH is a developmental defect that differs from amelogenesis and hypoplasia?
Yes 234 (91.1) 119 (91.5) 24 (100.0) 91 (88.3) 0.190*
No 23 (8.9) 11 (8.5) 0 (0.0) 12 (11.7)
What is the prevalence of MIH in Portugal?
 < 5% 38 (14.8) 18 (13.8) 1 (4.2) 19 (18.4) 0.163*
5–10% 84 (32.7) 38 (29.2) 6 (25.0) 40 (38.8)
10–20% 44 (17.1) 25 (19.2) 6 (25.0) 13 (12.6)
 > 20% 38 (14.8) 18 (13.8) 1 (4.2) 19 (18.4)
Not sure 61 (23.7) 31 (23.8) 6 (25.0) 24 (23.3)
Which of the following might be the etiology of MIH:
Genetic factors 143 (55.6) 81 (62.3) 7 (29.2) 55 (53.4) 0.1875*
Environmental factors 89 (34.6) 44 (33.8) 8 (33.3) 37 (35.9)
Acute medical conditions affecting the hand or child 93 (36.2) 55 (42.3) 7 (29.2) 31 (30.1)
Chronic medical condition affecting mother and child 79 (30.7) 39 (30.0) 6 (25.0) 34 (33.0)
Antibiotics or medications 94 (36.6) 50 (38.5) 5 (20.8) 39 (37.9)
Exposure to fluoride 29 (11.3) 18 (13.8) 0 (0.0) 11 (10.7)
Unknown etiology 133 (51.8) 72 (55.4) 18 (75.0) 43 (41.7)
What is the period/duration that this occurrence can happen?
During the pregnancy 46 (17.9) 25 (19.2) 3 (12.5) 18 (17.5) 0.476*
First year of life 26 (10.1) 16 (12.3) 0 (0.0) 10 (9.7)
Third year of life 12 (4.7) 8 (6.2) 0 (0.0) 4 (3.9)
Pregnancy up to the first year of life 71 (27.6) 34 (26.2) 9 (37.5) 28 (27.2)
Pregnancy up to the third year of life 102 (39.7) 47 (36.2) 12 (50.0) 43 (41.7)
In your opinion, do you think the pattern of caries related to MIH is different from the classic caries pattern?
Yes 228 (88.7) 117 (90.0) 23 (95.8) 88 (85.4) 0.385*
No 10 (3.9) 3 (2.3) 1 (4.2) 6 (5.8)
Not sure 19 (7.4) 10 (7.7) 0 (0.0) 9 (8.7)
Knowledge score, mean (SD) [min–max] 41.3 (5.7) [21–60] 41.9 (6.0) [21–60] 41.5 (5.7) [35–46] 40.5 (3.6) [25–52] 0.214**
  1. GDPs General Dental Practitioners, PDs Pediatric Dentists, ODSs Other Dental Specialties
  2. *Statistically significant (p < 0.05), Pearson’s chi-square (χ2) test
  3. **Statistically significant (p < 0.05), Kruskal–Wallis test