Development of the Short-Form Yin Deficiency Scale Using Three Item Reduction Approaches
Table 6
Equidiscriminatory item-total correlation results by three percentile points.
25% cut-off points of the total scores (72 points)
Spearman correlation
50% cut-off points of the total scores (88 points)
Spearman correlation
75% cut-off points of the total scores (104 points)
Spearman correlation
Dry moutha
0.500
Weakness of the lower limbsa
0.555
Night fever
0.531
Night fevera
0.477
Low back pain
0.548
Afternoon fever
0.528
Low back paina
0.477
Afternoon flusha
0.529
Night itcha
0.505
Night hot solesa
0.473
Night fever
0.523
Afternoon flush
0.503
Afternoon fevera
0.467
Dull pain in the heela
0.523
Rough skina
0.491
Weakness of the lower limbs
0.450
Afternoon fever
0.521
Night hot soles
0.471
Sweating during sleep
0.446
Persistent cougha
0.509
Weakness of the lower limbs
0.433
Residual urine
0.440
Residual urinea
0.504
Residual urine
0.420
Bone steaming
0.437
Night hot soles
0.497
Dark yellow urinea
0.409
Dull pain in the ankle or knee
0.436
Night itch
0.491
Dry mouth
0.380
Afternoon flush
0.435
Dull pain in the ankle or knee
0.457
Morning fatiguea
0.371
Fatigue
0.424
Bone steaming
0.451
Hair lossa
0.368
Dull pain in the heel
0.422
Morning fatigue
0.434
Dull pain in the heel
0.367
Afternoon cough
0.410
Sweating during sleep
0.432
Tinnitus
0.348
Night itch
0.384
Afternoon cough
0.430
Persistent cough
0.339
Dry and cracked heel
0.361
Night cough
0.428
Waking up due to night urination
0.325
Night cough
0.355
Fatigue
0.420
Afternoon cough
0.324
Dark yellow urine
0.338
Rough skin
0.420
Low back pain
0.323
Rough skin
0.331
Dark yellow urine
0.403
Night cough
0.322
Morning fatigue
0.328
Susceptibility to heat and cold
0.398
Dull pain in the ankle or knee
0.320
Persistent cough
0.326
Dry mouth
0.386
Sweating during sleep
0.318
Tinnitus
0.324
Hair loss
0.333
Susceptibility to heat and cold
0.313
Difficulty containing urine
0.303
Waking up due to night urination
0.322
Difficulty containing urine
0.310
Susceptibility to heat and cold
0.301
Difficulty containing urine
0.315
Frequent urination
0.307
Waking up due to night urination
0.293
Tinnitus
0.307
Fatigue
0.299
Hair loss
0.282
Frequent urination
0.294
Dry and cracked heel
0.296
Frequent urination
0.276
Dry and cracked heel
0.294
Bone steaming
0.276
a15 items by summation of five top-ranked items among three percentile categories. All Spearman correlations had . Among the 15 items, “hair loss” had lowest EITC (0.368) and was finally removed.