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Table 1 Psychometric properties of odor interpretation and odor naming tasks in the schizophrenia sample (N=881)

From: Odor naming and interpretation performance in 881 schizophrenia subjects: association with clinical parameters

  Odor naminga Odor interpretation (odors)b   Odor interpretation (attributes)b
Item difficulty (weighted % correct naming ± 95%CI)
Pineapple 21.71 ± 0.01 73.0 ± 1.7 Pleasant 81.7 ± 1.2
Petrol 38.67 ± 0.02 78.2 ± 1.3 Sweet 72.6 ± 1.1
Mint 76.35 ± 0.03 78.0 ± 1.2 Hot 69.5 ± 1.4
Rose 39.99 ± 0.02 80.2 ± 1.3 Technical 81.3 ± 1.1
Natural gas 16.61 ± 0.02 70.9 ± 1.6 Natural 75.1 ± 1.3
Licorice 54.48 ± 0.03 82.3 ± 1.3 Edible 80.4 ± 1.2
    Dangerous 79.5 ± 1.1
Item discrimination, part-whole corrected [95%CI]
Pineapple 0.24 [0.18, 0.30] 0.21 [0.15,0.27] Pleasant 0.46 [0.40,0.51]
Petrol 0.25 [0.19, 0.31] 0.25 [0.19,0.31] Sweet 0.33 [0.27,0.39]
Mint 0.30 [0.24, 0.36] 0.27 [0.20,0.33] Hot 0.18 [0.11, 0.24]
Rose 0.28 [0.21, 0.34] 0.18 [0.11,0.24] Technical 0.58 [0.53, 0.62]
Natural gas 0.13 [0.07, 0.20] 0.16 [0.09,0.22] Natural 0.45 [0.40,0.50]
Licorice 0.27 [0.20, 0.33] 0.20 [0.14,0.27] Edible 0.52 [0.47,0.56]
    Dangerous 0.52 [0.47,0.56]
Item discrimination, not part-whole corrected [95%CI]
Pineapple 0.41 [0.35, 0.46] 0.57 [0.52,0.61] Pleasant 0.63 [0.59,0.67]
Petrol 0.50 [0.45, 0.54] 0.53 [0.48,0.58] Sweet 0.52 [0.47,0.56]
Mint 0.60 [0.55, 0.64] 0.52 [0.47,0.57] Hot 0.44 [0.38,0.49]
Rose 0.56 [0.51, 0.61] 0.45 [0.40,0.50] Technical 0.72 [0.69,0.75]
Natural gas 0.33 [0.26, 0.39] 0.50 [0.45, 0.55] Natural 0.64 [0.60,0.68]
Licorice 0.65 [0.62, 0.69] 0.48 [0.43,0.53] Edible 0.68 [0.64,0.71]
    Dangerous 0.66 [0.62,0.70]
Internal consistency (standardized Cronbach’s α, equals average split-half reliability)
  0.50 [0.47, 0.54] 0.44 [0.40,0.48]   0.72 [0.71,0.74]
  1. Abbreviations: CI, confidence interval. aPsychometric measures were calculated based on Spearman correlation (ordinal data). bPsychometric measures were calculated based on Pearson correlation (metric data).