Table 3.

Agreement between clinical variables in the DNOR and the same information from the medical records estimated from a random sample of 100 patients

Selected clinical variables	Medical records/DNORa (numbers)	Agreement (%)	95 % CI (%)	Kappab (k value)
Onset symptoms
Focal deficit	83/99	84	75–90	0.61
Seizure	89/99	90	82–95	0.71
Cognitive change	75/99	76	66–84	0.52
Headache	83/99	84	75–90	0.61
Diagnostic work-up
Preoperative MRI performed	100/100	100	–	1.0
Date of preoperative MRI (±1 day)	83/99	84	75–90	–
Preoperative MRI: number of tumors	92/99	93	86–97	0.75
Preoperative MRI: contrast enhancement	85/87	98	92–100	0.49
Preoperative MRI: crossing midline	82/90	91	83–96	0.62
Preoperative MRI: localization	92/99	93	86–97	0.75
Preop. MRI: tumor diameter (±5 mm)	51/91	56	45–66	–
Preop. MRI: orthogonal diam. (±5 mm)	43/75	57	45–69	–
Surgery
Procedure code of surgery	77/100	77	68–85	0.63
Date of surgery (±1 day)	99/100	99	95–100	–
Postoperative MRI performed	93/100	93	86–97	0.72
Date of postoperative MRI (±1 day)	76/82	93	84–97	–
Residual tumor on postoperative MRI	65/81	80	70–88	0.52
Radiotherapy
Performance status before radiotherapy	53/57	93	83–98	0.87
Date of 1st radiation therapy (±1 day)	88/100	88	80–94	–
Treatment status, radiotherapy	95/100	95	89–98	0.43
Chemotherapy
Performance status before chemotherapy	52/57	91	80–97	0.84
Date of 1st Chemotherapy (±1 day)	80/92	87	78–93	–
Treatment status, chemotherapy	82/91	90	82–95	0.63

MRI magnetic resonance imaging, DNOR Danish Neuro-Oncology Registry, CI confidence intervals

^aTotals in DNOR varies between variables because not all information was available

^bKappa: poor agreement if k ≤ 0.4, fair to good agreement if 0.4 < k<0.75 and excellent agreement if k ≥ 0.75