Table 4.

Efficacy of mammogram and ultrasound in detecting residual tumor.

	Histological findings		Sensitivity e (%)	Specificity f (%)	Negative predictive value g (%)	Positive predictive value h (%)
	Residual tumor No. (%)	No residual tumor No. (%)
Mammogram findings (n=53)			36.3	90.0	46.2	85.7
Residual tumor	12 (22.6) (a)	2 (3.8) (b)
No residual tumor	21(39.6) (c)	18 (34.0) (d)
Ultrasound findings (n=115)			38.2	91.5	50.6	86.7
Residual tumor	26 (22.6) (a')	4 (3.5) (b')
No residual tumor	42 (36.5) (c')	43 (37.4) (d')

^e Sensitivity = a/ (a + c) for mammogram or a'/ (a' + c') for ultrasound.

^f Specificity = d/ (b + d) for mammogram or d'/ (b' + d') for ultrasound.

^g Negative predictive value = d/ (c + d) for mammogram or d'/ (c' + d') for ultrasound.

^h Positive predictive value = a/ (a + b) for mammogram or a'/ (a' + b') for ultrasound.