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Table 3 Norm values for DESC-I

From: Validation of the Rasch-based Depression Screening in a large scale German general population sample

raw score frequency percentage percentiles θ Z T
0 841 33.5 33.5 -5.80 -1.09 39
1 390 15.5 49.1 -4.52 -0.38 46
2 271 10.8 59.9 -3.71 0.07 51
3 199 7.9 67.8 -3.19 0.36 54
4 153 6.1 73.9 -2.78 0.59 56
5 126 5.0 78.9 -2.42 0.79 58
6 105 4.2 83.1 -2.10 0.97 60
7 66 2.6 85.7 -1.81 1.13 61
8 69 2.8 88.5 -1.53 1.29 63
9 61 2.4 90.9 -1.26 1.44 64
10 60 2.4 93.3 -1.00 1.58 66
11 59 2.4 95.7 -0.75 1.72 67
12 42 1.7 97.3 -0.51 1.86 69
13 14 .6 97.9 -0.28 1.99 70
14 11 .4 98.3 -0.06 2.11 71
15 11 .4 98.8 0.16 2.23 72
16 8 .3 99.1 0.37 2.35 73
17 6 .2 99.3 0.57 2.46 75
18 4 .2 99.5 0.78 2.58 76
19 3 .1 99.6 0.98 2.69 77
20 3 .1 99.7 1.18 2.80 78
21 2 .1 99.8 1.38 2.91 79
22 1 .0 99.8 1.59 3.03 80
23 1 .0 99.9 1.82 3.16 82
26 1 .0 99.9 2.61 3.60 86
27 1 .0 100.0 2.97 3.80 88
>/= 28 1 .0 100.0 3.45 4.07 91
  1. Note: θ: estimated person's latent trait score for depression; Z: mean = 0, SD = 1; T: mean = 50, SD = 10