Table 1.

Comparison of Nurses' Recommendations from Survey Phone Interviews and Computerized Call Records, for All Study Callers

	Computerized Record (CR)
Self Report (SR)	Yes	No	Total
Yes	1,223 (a)*	543 (b)	1,766 (a+b)
No	659 (c)	2,094 (d)	2,753 (c+d)
Total	1,882 (a+c)	2,637 (b+d)	4,519 (N)

^*The values a, b, c, and d denote the observed frequencies for each possible combination of CR and SR, corresponding respectively to TP, FP, FN, and TN.