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Re: About the 'CALENDAR' variables [message #12090 is a reply to message #11760]

Tue, 28 March 2017 13:50

Trevor-DHS
Messages: 805
Registered: January 2013

Senior Member

Pre-term births are determined using the calendar (VCAL$1), and the duration of pregnancy prior to a birth. This can be determined by looking at the number of "P" letters preceding a "B" in the calendar string. One character in the calendar string in VCAL$1 represents one month.

Below is an example of what a calendar might look like:

Position         1         2         3         4         5         6         7         8
        ....5....0....5....0....5....0....5....0....5....0....5....0....5....0....5....0
Date    <-2015-><---2014---><---2013---><---2012---><---2011---><---2010---><---2009--->
        AJJMAMFJDNOSAJJMAMFJDNOSAJJMAMFJDNOSAJJMAMFJDNOSAJJMAMFJDNOSAJJMAMFJDNOSAJJMAMFJ
VCAL$1	           11111111000BPPPPPPPP88888000000000111111110000000033333300TPP00000000
VCAL$2	                               1             4               5

In VCAL$1 at the time of interview in September 2014 in this example, the respondent was using pill (code 1). October 2013 in this example the respondent had a birth (code B) which was preceded by an additional 8 months of pregnancy (8 P's) for a total of 9 months including the month of birth. For pre-term births you would see fewer than 8 P's.

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		About the 'CALENDAR' variables By: brammaputram@yahoo.fr on Tue, 07 February 2017 01:01
		Re: About the 'CALENDAR' variables By: Trevor-DHS on Tue, 28 March 2017 13:50

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