Table 3 Recalled versus actual phone use by categories of phone use for number of calls.

Actual number of calls/month	Recalled number of calls/month
	<30	30–60	60–100	100–175	>175	Total
<30	101	12	13	6	4	136
30–60	64	28	26	11	6	135
60–100	33	19	38	26	19	135
100–175	12	11	33	34	42	132
>175	6	4	14	25	85	134
Total	216	74	124	102	156	672