Timing of invitation	First question embedded				Traditional email
	Clicked on embedded survey item	Clicked on embedded survey item (%)	Completed 80% or more of the survey	Completed 80% or more of the survey (%)	Clicked on survey link	Clicked on survey link (%)	Completed 80% or more of the survey	Completed 80% or more of the survey (%)
T1- Five weeks before the test	1,293	62.43	681	55.01	778	37.57	557	44.99
T2- Four weeks before the test	1,299	64.85	664	55.52	704	35.15	532	44.48
T3- Two weeks before the test	1,297	63.55	667	53.70	744	36.45	575	46.30
T4- Test day	1,490	64.61	829	57.61	816	35.39	610	42.39
T5- One week after the test	1,425	64.80	756	57.93	774	35.20	549	42.07
T6- Three weeks after the test	1,004	65.84	533	55.75	521	34.16	423	44.25
Total	7,808		4,130		4,337		3,246