Table 3. Reclassification of the predicted 10-year risk of incident coronary heart disease for a risk score based on both the Framingham risk score and long working hours compared to the Framingham risk score alone.

Status at follow-up examination	CHD risk by Framingham alone	CHD risk by Framingham and working hours			Reclassified		Net correctly reclassified (%)
		<5.0%	5.0 - 9.9%	≥10.0%	Increased risk	Decreased risk
Incident case (N=192)
	<5.0%	139	11	0	14	4	5.2%
	5.0-9.9%	4	27	3
	≥10.0%	0	0	8
Non-case (N=6903)
	<5.0%	6280	124	0	137	102	-0.5%
	5.0-9.9%	85	304	13
	≥10.0%	0	17	80
Net Reclassification Improvement (95% CI)		Observed					4.7% (0.3, 9.1) p=0.034
		Bootstrap					4.7% (0.8, 8.8)