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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