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Table 3 Correlation of clinical and self-reported number of teeth in study sample 1 (n = 586)

From: The validity of self-reported number of teeth and edentulousness among Norwegian older adults, the HUNT Study

  Clinical number of teeth Self-reported number of teeth Spearmana 95% CI Pearsona 95% CI
Median (IQR) Mean (SD) Median (IQR) Mean (SD)
Total 23 (19–26) 21.0 (7.2) 23 (18–26) 20.8 (7.9) 0.86 0.84–0.88 0.91 0.90–0.92
Sex         
 Female 23 (19–26) 21.1 (7.2) 23 (18–26) 20.7 (7.8) 0.88 0.85–0.91 0.93 0.91–0.94
 Male 23 (18.5–26) 20.9 (7.2) 23 (18–26) 20.8 (8.0) 0.84 0.81–0.88 0.90 0.87–0.92
Age         
 70–74 years 25 (21–27) 22.7 (6.0) 24 (20–27) 22.6 (6.7) 0.83 0.80–0.87 0.90 0.87–0.92
 75 + years 21 (16–25) 18.9 (8.0) 21 (12–25) 18.5 (8.7) 0.87 0.84–0.90 0.91 0.89–0.93
Educationb         
 Primary/secondary school 22 (17–25) 19.8 (7.7) 22 (16–26) 19.6 (8.2) 0.88 0.85–0.90 0.93 0.91–0.94
 College/university 25 (21–27) 23.3 (5.5) 25 (20–27) 22.9 (6.8) 0.81 0.75–0.85 0.85 0.81–0.84
Smoking statusb         
 Never smokers 24 (21–26) 22.6 (5.6) 24 (20–26) 22.6 (6.3) 0.81 0.76–0.85 0.87 0.84–0.90
 Ever smokers 23 (17–26) 20.2 (7.7) 22 (15–26) 19.9 (8.5) 0.88 0.85–0.90 0.92 0.90–0.93
Cognitive functionb         
 No cognitive impairment 24 (20–26) 21.7 (6.8) 24 (19–27) 21.2 (7.5) 0.87 0.85–0.90 0.91 0.89–0.93
 Mild cognitive impairment 23 (19–26) 20.7 (7.2) 23 (18–26) 20.8 (8.2) 0.84 0.78–0.88 0.90 0.86–0.93
 Dementia 21 (13.5–23) 17.6 (8.0) 20 (10.5–23.5) 17.3 (8.6) 0.74 0.52–0.87 0.85 0.71–0.92
Self-perceived general healthb         
 Good 24 (20–26) 21.7 (6.7) 24 (19–27) 21.5 (7.5) 0.86 0.83–0.88 0.91 0.89–0.92
 Poor 23 (17–25) 19.5 (8.1) 21 (14–26) 19.1 (8.6) 0.87 0.83–0.90 0.92 0.89–0.94
Self-perceived oral healthb         
 Good 24 (20–26) 22.3 (6.2) 24 (20–27) 22.2 (7.0) 0.83 0.80–0.86 0.88 0.86–0.90
 Poor 18 (8–22.5) 15.5 (7.9) 15 (8–21) 14.4 (8.0) 0.91 0.86–0.94 0.92 0.88–0.95
Clinical number of teeth         
 ≤ 19 teeth 14 (6–17) 11.4 (6.7) 11 (5–18) 11.5 (7.7) 0.90 0.86–0.92 0.90 0.86–0.92
 ≥ 20 teeth 25 (23–27) 24.6 (2.5) 25 (22–27) 24.3 (4.3) 0.76 0.72–0.80 0.67 0.61–0.72
Fixed prosthodonticsc         
 None 21 (4–26) 15.8 (10.9) 20 (4–26) 16.1 (11.2) 0.98 0.97–0.99 0.99 0.99–1.00
 1–2 teeth 25 (21–27) 23.1 (6.1) 26 (21–27) 23.2 (6.4) 0.91 0.87–0.94 0.95 0.93–0.97
 3–4 teeth 24 (21–26) 22.9 (4.8) 24 (20–27) 23.2 (5.3) 0.83 0.75–0.88 0.87 0.80–0.91
 5 or more teeth 23 (19–25) 21.7 (5.1) 22 (18–26) 21.0 (6.6) 0.75 0.69–0.80 0.77 0.72–0.82
  1. CI confidence interval, IQR: interquartile range, SD standard deviation
  2. aAll p values < 0.001
  3. bMissing information for education (n = 3), smoking status (n = 6), cognitive function (n = 61), self-perceived oral health (n = 29), self-perceived general health (n = 6)
  4. cTeeth restored or replaced by fixed prosthodontics (i.e., crowns, implants, bridge abutments and pontics)