Table 5.

Results of chart validation of smoking and obesity compared with insurance claims

	Chart and claims, n	Chart only, n	Claims only, n	Not in chart or claims, n	Sensitivity, %	Specificity, %	PPV, %	NPV, %
Smoking per claims algorithma versus current smoker in chartb
Algorithm 1	4	20	1	191	16.67	99.48	80.00	90.52
Algorithm 2	12	12	7	185	50.00	96.35	63.16	93.91
Algorithm 3	15	9	14	178	62.50	92.71	51.72	95.19
Algorithm 4	15	9	15	177	62.50	92.19	50.00	95.16
Smoking per claims algorithma versus current or former smoker in chartb
Algorithm 1	5	62	0	150	7.46	100.00	100.00	70.75
Algorithm 2	18	49	1	149	26.87	99.33	94.74	75.25
Algorithm 3	24	43	5	145	35.82	96.67	82.76	77.13
Algorithm 4	25	42	5	145	37.31	96.67	83.33	77.54
Obesity per claims algorithma versus BMI ≥ 30 in chartb
Algorithm 1	4	52	0	118	7.14	100.00	100.00	69.41
Algorithm 2	7	49	0	118	12.50	100.00	100.00	70.66
Algorithm 3	10	46	1	117	17.86	99.15	90.91	71.78

BMI body mass index, PPV positive predictive value, NPV negative predictive value

^a See Table 1 for description of each algorithm

^b Among those with non-missing information in the medical chart (n = 216 current smoker, n = 217 current or former smoker, n = 174 BMI)