The baptisms of children of members is also a part of the field service; the WTBTS sees it that way as far as counting bible studies, hours preached, and literature placed. The difference is that the audience in this case is somewhat captive; they can't close the door. At least until they move out of the house.
An intersting derived statistic is the conversion rate. This is nominally the number of baptisms divided by the number of bible studies. Some family bible studies may be with baptized members, but probably at least one person (and maybe more than one) in each of such is unbaptized. The WTBTS does not publish the total bible study count, but does give the average bible study count. Some bible studies may go on for years, but others may last only a few weeks. If we assume that a bible study lasts about one year, then the conversion rate for 2000 was:
(baptism count) / (average bible studies) = 288907 / 4766631 = 0.0606
So about six percent of bible studies lead to a baptism. Just slightly less than one out of sixteen.
Conversion rates for some (mostly) English speaking countries:
Australia: 8.23%
Britain: 7.31%
Canada: 6.99%
Ireland: 7.75%
New Zealand: 6.98%
United States: 7.13%
All of the above are higher than the average. Are study conductors in these countries more efficient? Perhaps so, although the baptism count overall trend for each of the above is not encouraging (to the WTBTS, at least).
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Another list: "lands" with ZERO baptisms in 2000:
American Samoa
Anguilla
Azerbajan
Comoros
Falkland Islands
Libya
Liechtenstein
Mayotte
Montserrat
Nauru
Nevis
Niue
Norfolk Island
Saba
St. Eustatius
St. Pierre & Miquelon
Tinian
Tokelau