Table 1.
Psychometric properties of odor interpretation and odor naming tasks in the schizophrenia sample (N=881)
| 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] | ||
Abbreviations: CI, confidence interval. aPsychometric measures were calculated based on Spearman correlation (ordinal data). bPsychometric measures were calculated based on Pearson correlation (metric data).