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Table 1 Age, oral conditions, salivary flow rate, and concentration and secretion rate of transferrin in younger and older female subjects

From: Clinical factors affecting salivary transferrin level, a marker of blood contamination in salivary analysis

  Younger (n = 30) Older (n = 20) P value
Age (years) 25.9 ± 2.1 65.1 ± 9.0 < 0.001**
Tooth number 28.0 ± 2.0 24.9 ± 6.0 0.003**
Total gingival index 17.7 ± 16.0 23.2 ± 10.6 < 0.001**
Flow rate (mL/min) UWS 0.46 ± 0.27 0.20 ± 0.16 0.078
SWS 1.54 ± 0.48 0.83 ± 0.43 0.556
Concentration of transferrin (mg/dL) UWS 1.16 ± 0.96 0.65 ± 0.82 0.357
SWS 0.49 ± 0.38 0.29 ± 0.30 0.227
Secretion rate of transferrin (μg/min) UWS 4.18 ± 2.87 0.90 ± 0.84 < 0.001**
SWS 6.62 ± 4.44 1.62 ± 0.90 < 0.001**
  1. UWS, unstimulated whole saliva; SWS, stimulated whole saliva
  2. Total gingival index reflects the degree of overall gingival inflammation in the oral cavity
  3. Secretion rates of transferrin were calculated by multiplying the flow rates of saliva and their corresponding concentrations of transferrin
  4. The results in the table are from our two previous studies. The data from younger females were adapted from Lee et al. [10] and those from older females were adapted from Suh et al. [14]
  5. **P < 0.01 by the Student’s t-test