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Table 3 Comparison of the five items among 4 groups (X̄±s)

From: The items in the Chinese version of the Montreal cognitive assessment basic discriminate among different severities of Alzheimer’s disease

  Index (X̄±s) NC MCI Mild AD Moderate-severe AD F (P) Bonferroni correction
Low-level education (n = 131) Verbal fluency 11.1 ± 2.7 8.2 ± 2.5 6.3 ± 2.3 4.3 ± 1.7 21.743 (0.000) a; b; c; d; e; f;
Orientation 6 ± 0 5.7 ± 0.5 3.7 ± 1.7 1.4 ± 0.8 36.481 (0.000) b; c; d; e; f;
Visual perception 5.9 ± 2.6 4.1 ± 2.4 2.6 ± 2.3 1.1 ± 1.3 12.022 (0.000) b; c; d; e;
Immediate recall 7.8 ± 1.7 6.8 ± 2.5 5.1 ± 2.4 2.6 ± 2.1 13.419 (0.000) b; c; d; e; f;
Delayed recall 9.4 ± 3.1 5.2 ± 3.4 1.9 ± 2.8 1 ± 1.9 28.411 (0.000) a; b; c; d; e;
Middle-level education (n = 381) Verbal fluency 10.8 ± 2.2 9.5 ± 2.7 7.3 ± 2.5 4.2 ± 2.7 53.341 (0.000) a; b; c; d; e; f;
Orientation 5.9 ± 0.2 5.7 ± 0.5 4.2 ± 1.3 2.2 ± 1.2 115.913 (0.000) b; c; d; e; f;
Visual perception 7.3 ± 1.6 6.3 ± 2.3 4.6 ± 2.5 2.3 ± 1.9 37.701 (0.000) b; c; d; e; f;
Immediate recall 8.1 ± 1.3 7.2 ± 1.8 6.1 ± 2.1 3.8 ± 2.5 34.823 (0.000) b; c; d; e; f;
Delayed recall 10.0 ± 2.5 6.5 ± 3.5 3.3 ± 3.1 1.6 ± 2.2 70.979 (0.000) a; b; c; d; e;
High-level education (n = 877) Verbal fluency 11.3 ± 2.8 9.2 ± 2.5 6.9 ± 2.4 5.4 ± 2.3 167.674 (0.000) a; b; c; d; e; f;
Orientation 5.9 ± 0.3 5.7 ± 0.5 4.2 ± 1.4 2.8 ± 1.3 347.124 (0.000) b; c; d; e; f;
Visual perception 7.5 ± 1.9 6.2 ± 2.3 4.1 ± 2.6 2.9 ± 2.7 130.8 (0.000) a; b; c; d; e; f;
Immediate recall 8.4 ± 1.4 7.4 ± 1.7 6.1 ± 2.2 5.1 ± 2.2 96.481 (0.000) a; b; c; d; e; f;
Delayed recall 10.2 ± 3.4 5.5 ± 3.7 2.3 ± 3.1 1.1 ± 1.8 284.412 (0.000) a; b; c; d; e;
  1. a: p < 0.05,NC vs. MCI; b: p < 0.05, NC vs. mild AD; c: p < 0.05, NC vs. moderate-severe AD; d: p < 0.05, MCI vs. mild AD; e: p < 0.05, MCI vs. moderate AD; f: p < 0.05, mild AD vs. moderate AD. NC, cognitively normal controls; MCI, mild cognitive impairment; AD, Alzheimer’s disease