. 2018 Aug 1;154(10):1145–1151. doi: 10.1001/jamadermatol.2018.2312

Table 2. Prognostic Factors Associated With Poorer Therapeutic Hair Regrowth Outcomes.

Prognostic Factor	No. of Studies	No. of Patients	No. of Controls	Odds Ratio (95% CI)
SALT score ≥50	35	1134	810	3.05 (2.26-4.11)
Disease duration ≥1 y	7	299	143	1.56 (0.95-2.55)
Atopic disease^a	14	191	415	1.61 (1.03-2.50)
Nail involvement	10	251	353	2.06 (1.26-3.36)

Abbreviation: SALT, Severity of Alopecia Tool (where higher scores indicate greater hair loss).

^{^a}

Personal history of atopic dermatitis, allergic rhinitis, or asthma.