Table 1.

International Classification of Diseases (ICD) codes for the included mental health outcomes.

	ICD 7 (1964–1968)	ICD 8 (1969–1986)	ICD 9 (1987–1996)	ICD 10 (1997–2015)
Depression	301.1, 314, 790.2	296.2, 300.4	296B, 300E, 311	F32-F39
Anxiety	310.99, 311.99, 312.99	300 excluding 300.4	300 excluding 300E	F40-F4
Schizophrenia	300, 300.6	295.0–295.4, 295.6, 295.8, 295.9	295A-295E, 295G, 295H, 295W, 295X	F20, F25
Bipolar	301.0	296.0–296.3, 296.8, 296.9	296A-296E, 296W, 296X	F30, F31
Stress- related	—	307, 308.4	308, 309	F43