. Author manuscript; available in PMC: 2014 Aug 1.

Published in final edited form as: J Consult Clin Psychol. 2013 Apr 29;81(4):10.1037/a0032879. doi: 10.1037/a0032879

Table 2.

Formulas for Pairwise Conversions among Three Depressive Symptom Measures Based on Their Common Factor

Measure	Measure Known
Estimated (± SE)	BDI	HRSD	IDS-SR
BDI (± 2.65) =	---	−3.86 + 1.51(HRSD)	−1.75 + 0.72(IDS-SR)
HRSD (± 2.92) =	2.55 + 0.66(BDI)	---	1.40 + 0.48(IDS-SR)
IDS-SR (± 2.43) =	2.42 + 1.38(BDI)	−2.92 + 2.09(HRSD)	---

Note. BDI = 21-item Beck Depression Inventory. HRSD = 17-item Hamilton Rating Scale for Depression. IDS-SR = 30-item Inventory for Depressive Symptomatology--Self-Report. Observed ranges: BDI 0-59, HRSD 0-37, IDS-SR 0-74. To convert an HRSD score of 20 to the IDS-SR, for example, use the formula IDS-SR = −2.92 + 2.09(HRSD); substitute the known HRSD score in the equation, −2.92 + 2.09(20); and solve to yield IDS-SR ≈ 39.