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Date: | Sat, 21 Jul 2007 20:34:14 -0400 |
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Dear all:
Preliminary results:
I'm not done yet, but have competed well over 200 measurements so far with various
assorted bottles and fat contents. Test weighing shows a high degree of precision to
within the specified 2 g difference of the scale manufacturer. Eyeballing bottles has far
better precision than I expected even with drop in liners!! At fat levels of 33% you start
to get a decrease in precision with the eyeballing the bottle method.
Eyeballing a bottle consistently overestimates the weight of the bottle by a mere 2 - 3 g.
Again, you lose accuracy as the fat content climbs and I base this conclusion on the fact
that at 33% fat it is hard to read the measurements because the fatty cream sticks to the
bottle. I highly doubt anyone makes milk at a 33% concentration. The ranges I saw in
my brief look at Lawrence were up to 6% only. I think most of the error is in reading the
bottom of the meniscus.
What remains to be seen if the measurement of a static object is fairly precise and
accurate --- is what the dribble factor and wiggle factor is when you measure the baby
itself.
The wiggle factor from measuring babies feeding from the breast is very low --- again
within the precision of the weighing scale of 2 g. The difference between error rates with
breastfeeding babies and bottle feeding babies should be the dribble.
So, I have more faith in eyeballing bottles than I did before. Of course, I didn't smoosh
up the drop in liners like some mothers do, but even so, who would have thought you
could reasonably estimate the contents with a drop in liner with 1 oz increments?
Best, Susan Burger
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