Sales estimates for ALGN

Yearly Sales Estimates for ALGN

Estimate Year	High Estimate	Low Estimate	Mean Estimate	Standard Deviation	Latest Estimate
2007	284	281.6	282.875	0.877	12/31/2007
2008	305.4	302.1	303.481	1.196	1/5/2009
2009	307.6	294	304.575	4.034	11/16/2009
2010	351.17	313	332.877	12.614	10/23/2009
2011	404.2	348	376.987	20.895	10/23/2009
2012	364	364	364	0	8/13/2009

Quarterly Sales Estimates for ALGN

Qtr Ending	High Estimate	Low Estimate	Mean Estimate	Standard Deviation	Latest Estimate
03-2007	59.6	57	58.397	0	3/23/2007
06-2007	74.8	72	73.031	1.033	6/25/2007
09-2007	72.9	70.3	71.263	0.834	10/1/2007
12-2007	72	69.7	71.032	0.866	1/28/2008
03-2008	72.8	71.34	72.038	0.515	4/16/2008
06-2008	80.2	78.6	79.424	0.603	7/23/2008
09-2008	79	71.8	74.463	2.612	10/13/2008
12-2008	75.6	72.25	73.595	1.211	1/5/2009
03-2009	67.9	65.231	66.851	0.968	4/14/2009
06-2009	70.5	68.3	69.574	0.817	7/22/2009
09-2009	74.804	72.5	73.295	0.748	10/20/2009
12-2009	81.9	79.5	80.263	0.733	11/16/2009
03-2010	82.62	79.492	80.416	1.478	10/23/2009
06-2010	88.8	82.9	84.841	2.702	10/23/2009
09-2010	88.38	84.167	86.187	1.814	10/23/2009
12-2010	91.38	85.434	87.962	2.876	10/23/2009
03-2011	95.16	95.16	95.16	0	10/23/2009