Table 2.

Response and retention rates in the five studies

Study	Mon	Tue	Wed	Thu	Fri	Sat	Sun	Total
1
Response	57	61	50	52	--	--	58	55
Retention	87	87	87	87	--	--	87	87
2
Response	88	--	--	--	83	79	84	83
Retention	76	--	--	--	78	75	75	76
3
No Holiday week
Response	56	51	50	51	56	55	--	54
Retention	96	93	92	90	93	92	--	93
Holiday week
Response	54	57	62	50	51	48	--	54
Retention	93	96	93	98	98	92	--	95
4
Response	29	24	24	26	23	29	26	26
Retention	99	99	99	98	98	99	99	99
5
Response	21	23	22	20	21	21	21	21
Retention	68	73	62	71	67	68	67	68
Totala
Response	36	31	30	30	28	30	31	31
Retention	87	88	84	88	85	86	84	86

Notes. Dashes indicate that no invitations were sent on that day

^aGrand mean across studies based on 25,582 and 9135 repeated observations for response and retention, respectively