Table 1.

Detailed Duo pruritus score system (0–40 score).

Scores	Extent of scratching	Distribution range	Frequency of attacks	Sleep disturbances
1	Light itching without scratching	One part	When the short attack (<10 min per time) occurs four times or the long attack (>10 min per time) occurs 1 time, 1 point is recorded, up to 5 points	Waking up for itching every time is recorded as 1 point, up to 14 points
2	Scratching without hurting skin	Scattering in different parts
3	Inching on without relieving after scratching	The whole body
4	Inching on after scratching with hurting skin	–
5	Dysphoria	–

Scores are recorded separately in the morning and afternoon, according to extent of scratching, distribution range, and frequency of attacks, in addition, 14 points from sleep disturbance. Thus, the highest score may be (5 + 3 + 5) × 2 + 14 = 40 during the 24 h.