Registration of acute medical hospital admissions in the Danish National Patient Registry: a validation study

Figures & data

Table 1 Characteristics of 158 medical hospital admissions in the North Denmark Region in 2009

Characteristics*	Medical hospital admission
	N (% of group)
	Acute (n = 127)	Nonacute (n = 31)
Sex
Women	64 (50.4)	10 (32.3)
Men	63 (49.6)	21 (67.7)
Age, years
Median	62	63
IQR	49–80	52–69
Smoking
Never	46 (36.2)	11 (35.5)
Current	32 (25.2)	6 (19.4)
Former	32 (25.2)	9 (29.0)
Unknown	17 (13.4)	5 (16.1)
Alcohol abuse
Never	86 (67.7)	14 (45.2)
Current	9 (7.1)	0 (0.0)
Former	2 (1.6)	1 (3.2)
Unknown	30 (23.6)	16 (51.6)
Body mass index
<18.5	3 (2.4)	0 (0.0)
≥18.5 and <25	25 (19.7)	6 (19.4)
≥25 and <30	16 (12.6)	7 (22.6)
≥30	23 (18.1)	7 (22.5)
Unknown	60 (47.2)	11 (35.4)

Note:

* information collected through the DNPR and medical record review.

Abbreviations: N, number; IQR, interquartile range; DNPR, Danish National Patient Registry.

Figure 1 Flowchart of the medical record review (MMR) process.

Table 2 Estimation of PPV, sensitivity, and specificity

DNPRa	Medical record review
	Acute	Nonacute	In total
Acute	124	3	127
Nonacute	3	28	31
In total	127	31	158
	Results (95% confidence intervals)
PPV (TP/(TP+FP))	97.6% (93.8%–99.3%)
Sensitivity (TP/(TP+FN))	97.6% (93.8%–99.3%)
Specificity (TN/(TN+FP))	90.3% (76.4%–97.2%)

Note:

a The Danish National Patient Registry.

Abbreviations: PPV, positive predictive value; DNPR, Danish National Patient Registry; TP, true positive; FP, false positive; FN, false negative, TN; true negative.