Dear all:

I am still collecting data on precision and accuracy and I am starting to get a picture that 
the dribble and the wiggle factors are real, but relatively minimal.  The more data I 
collect in clinic settings and support groups, the more I am concluding that there must 
have been some huge problem in the study published by the neonatologists on test 
weighing and eyeballing bottles.  

I have let tired moms eyeball the bottles with no instruction and they do not come up 
with a difference anywhere near the difference found by the neonatologies conducting the 
study on test weighing.  The largest variance was 8 ml by a tired mom who shifted the 
bottle at an angle.  Never once has there been a 15 ml difference.  I haven't yet tested a 
drop in liner bottle which would probably have higher imprecision --- but on the standard 
bottles that are marked at 5 ml increments, there is not such a big problem.

As for the dribble factor --- the largest difference I've found so far is about 6 ml.  The 
average is about 4 ml.  

As for the wiggle factor --- you know those babies who like to fling their legs up and 
down while they are on the scale, the largest difference so far is about 4 g.  I would 
hardly call that imprecise. 

I'm really wondering what went on in the study that accounted for such huge 
discrepencies!  

Best, Susan Burger

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