Using Discharge Abstracts to Evaluate a Regional Perinatal Network: Assessment of the Linkage Procedure of Anonymous Data

Table 1

Assessment of the linkage procedure: sensitivity, specificity, rates of true positives (TP), true negatives (TN), false negatives (FN), and false positives (FP), for each year.

Years	Records no.	Sensitivity (%)	Specificity (%)	TP (%)	TN (%)	FN (%)	FP (%)
1998	17865	89.04	95.25	85.68	3.59	10.55	0.18
1999	15769	97.53	97.82	89.04	8.52	2.25	0.19
2000	20941	97.24	97.77	86.35	10.50	2.45	0.70
2001	25070	93.03	87.47	78.99	13.20	5.92	1.89
2002	25489	94.17	89.74	79.72	13.76	4.94	1.57
2003	25264	93.82	86.84	78.64	14.05	5.18	2.13
2004	25976	88.26	87.31	69.14	18.91	9.20	2.75
2005	24440	93.13	86.02	70.57	20.84	5.20	3.39
2006	27238	97.09	77.74	73.97	18.51	2.21	5.30