PT  - JOURNAL ARTICLE
AU  - Catey Bunce
AU  - Krishna V Patel
AU  - Wen Xing
AU  - Nick Freemantle
AU  - Caroline J Doré
AU  - On behalf of the Ophthalmic Statistics Group
TI  - Ophthalmic statistics note 1: unit of analysis
AID  - 10.1136/bjophthalmol-2013-304587
DP  - 2014 Mar 01
TA  - British Journal of Ophthalmology
PG  - 408--412
VI  - 98
IP  - 3
4099  - http://bjo.bmj.com/content/98/3/408.short
4100  - http://bjo.bmj.com/content/98/3/408.full
SO  - Br J Ophthalmol2014 Mar 01; 98