TY - JOUR T1 - Using a tape measure for intra-observer variability. JF - Evidence Based Medicine JO - Evid Based Med SP - 104 LP - 104 DO - 10.1136/ebm.10.4.104 VL - 10 IS - 4 AU - Ian Wacogne Y1 - 2005/08/01 UR - http://ebm.bmj.com/content/10/4/104.abstract N2 - This helpful exercise shows inter-observer variability and needs only paper tape measures—1 per member of the group. If you are really short of money, a trip to Ikea can yield a couple. In the group, tell everyone: "Find 3 people in the group to measure your head circumference and tell you … ER -