Table 2.

Data on different algorithms used by ophthalmologists to determine ideal body weight in screening for hydroxychloroquine retinopathy

IBW algorithm	Height (inches)																	Threshold height (inches)	% toxic at 400 mg/d	% with ABW < IBW
	60	61	62	63	64	65	66	67	68	69	70	71	72	73	74	75	76
Wolfe2	100	105	110	115	120	125	130	135	140	145	150	155	160	165	170	175	180	67	80	10
Met Life women, small frame, mean15	109	112	115	118	121	124	127	130	133	136	139	142	145	148	151	154	157	69	94	10
Met Life women, large frame, mean15	130	133	136	139	143	148	150	153	157	160	163	166	169	172	175	178	181	62	16	31
NHLBI table10	123	127	131	135	140	144	148	153	158	162	167	172	177	182	186	192	197	63	29	27
Bergholz16	129	131	133	135	137	139	142	144	146	148	150	152	155	157	159	161	163	63	29	27
Michaelides8	98	101	105	108	112	116	119	123	127	131	135	138	142	146	150	154	158	70	98	5
Walvick7	114	118	121	125	128	132	135	139	142	146	149	153	156	160	163	167	170	66	70	16

Notes: Values given are ideal body weights in pounds corresponding to the algorithm of that row and the height of that column. Threshold height, the height at which 400 mg/d hydroxychloroquine exceeds 6.5 mg/kg/d for the ideal body weight algorithm represented on the row being examined. % toxic at 400 mg/d, the percentage of patients below the threshold height based on the sample of patients studied. % with ABW < IBW, the percentage of patients in whom the actual body weight falls below the ideal body weight based on the sample of patients studied.

Abbreviations: ABW, actual body weight; IBW, ideal body weight; Met Life, Metropolitan Life Insurance table for women; NHLBI, National Heart Lung and Blood Institute.