Validation of oesophageal cancer surgery data in the Swedish Patient Registry

Figures & data

Table I. Characteristics of 1358 patients undergoing esophagectomy between 1987 and 2005 in Sweden.

Characteristics	Number (%)
Sex
Men	1015 (75)
Women	343 (25)
Age
< 65	599 (44)
65–75	571 (42)
> 75	188 (14)
Stage
0–I	244 (18)
II	435 (32)
III	340 (25)
IV	111 (8)
Missing	228 (17)
Histology
Adenocarcinoma	495 (36)
Squamous carcinoma	809 (60)
Missing	54 (4)
Operation code
< 1997	724 (53)
≥ 1997	634 (47)

Table II. Positive predictive value (PPV) and 95% confidence interval (CI) for the transthoracic approach variable as part of oesophageal cancer resection in the Swedish Patient Registry compared to operation charts.

		Transthoracic approach in the Patient Registry (number)
		Yes	No*	Total
Transthoracic approach in the operation charts (number)	Yes	543	60	603
	No	1	30	31
	Total	544	90	634
		PPV 99.8% (543/544), 95% CI 99.0–100.0%

*No, transhiatal approach, unclear, or not oesophageal cancer surgery.

Table III. Positive predictive value (PPV) and 95% confidence interval (CI) for the transhiatal approach variable as part of oesophageal cancer resection in the Swedish Patient Registry compared to operation charts.

		Transhiatal approach in the Patient Registry (number)
		Yes	No*	Total
Transhiatal approach in the operation charts (number)	Yes	22	9	31
	No	10	593	603
	Total	32	602	634
		PPV 68.8% (22/32), 95% CI: 50.0–83.9%

*No, transthoracic, unclear, or not oesophageal cancer surgery.

Table IV. Positive predictive value (PPV) and 95% confidence interval (CI) for the gastric substitute variable as part of oesophageal cancer resection in the Swedish Patient Registry compared to operation charts.

		Gastric substitute in the Patient Registry (number)
		Yes	No*	Total
Gastric substitute in the operation charts (number)	Yes	627	29	656
	No	4	64	68
	Total	631	93	724
		PPV 99.4% (627/631), 95% CI 98.4–99.8%

*No, bowel substitute, no substitute, unclear, or not oesophageal cancer surgery.

Table V. Positive predictive value (PPV) and 95% confidence interval (CI) for the bowel substitute variable as part of oesophageal cancer resection in the Swedish Patient Registry compared to operation charts.

		Bowel substitute in the Patient Registry (number)
		Yes	No*	Total
Bowel substitute in the operation charts (number)	Yes	50	6	56
	No	23	645	668
	Total	73	651	724
		PPV 68.5% (50/73), 95% CI 56.6–78.9%

*No, gastric substitute, no substitute, unclear, or not oesophageal cancer surgery.