[Babase] Matured BY dates for females
Catherine Markham
amarkham at princeton.edu
Sun Aug 27 15:28:52 EDT 2006
Hi Susan,
Yes, I think you've got it. Taking 178 days prior to the birth of a
female's first infant was what Jeanne and I just did for assigning
matured BY dates (at least in most cases - sometimes different logic was
used to determine the matured BY date, but all that is written-up on a
case by case basis in the Babase change log).
If a female already had a matured date and that matured data did not
fall during a period of spotty monitoring (Jeanne gave me dates for each
study group to query), then I didn't question the matured date or its
status.
Thanks for pointing out the need to clarify that - let me know if I
still didn't explain it well.
Catherine
Susan Alberts wrote:
> Thanks Catherine. All of this was clear except one comment that I've
> asked about below.
>
>
>> All other females were investigated on a case by case basis. For
>> most, the earliest date indicating sexual maturity was 178 days
>> (average gestation) prior to the birth of their first documented
>> offspring.
>>
> Are you saying that you found females in the database that had maturity
> dates coresponding to 178 days before their first birth? Or are you
> saying that this was the method you used to assign "by" dates to females
> that were known to have matured but at an unknown date? In other words,
> are you saying that the rule for assigning a "by" date to a female was
> (1) if she was known to have at least one pregnancy and (2) we don't
> know her exact menarche date, then (3) she was given a by date
> coresponding to 178 days before the birth o9f the first known offspring?
>
> Thanks,
>
> Susan
>
> -----------------------------------------------
> Susan Alberts, Dept. Biology, Duke University, Durham NC 27708. Phone
> 919-660-7272, Fax 919-660-7293. alberts at duke.edu
>
>
>
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