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|id||Unique ID for this survey entry|
|IP ID||Each IP address is assigned an ID|
|firstname ID||Each name is assigned an ID. This is to help with duplicates.|
|motherbirthyear||Mother's birth year|
|motherbirthdate||Mother's birth date as a Unix timestamp. For confidentiality reasons I don't store exact birthdate, I pretend everyone was born on the 15th of the month.|
|multiples||How many babies were being born. 2 = twins, 3 triplets|
|pounds||Baby weight in pounds|
|grams||Baby weight in grams|
|previousbirths||How many births the mother had before this one. 0 = first baby.|
|previousbornonday||Based on IP address, names and dates, this is the born on day for the mother's previous birth.|
|lmpdate||Last menstrual period date|
|birthdate||Date baby was born|
|bornonday||Gestation time in days - difference between the date the baby was born and LMP date. If LMP date isn't known we assumed it was 280 days before the due date.|
|duedatebase||Whether due date was determined by ovulation, LMP, or ultrasound|
|induced||Induced = 1, spontaneous = 0|
|cesarean||Cesarean = 1|
|sex||Boy or Girl|
|exclude||Was this record excluded from charts for some reason (see page 1 for reasons)|
Due Date Survey DataDue date statistics: A study on the length of pregnancy
Probability of delivery resulting from spontaneous labor after 35 weeks
Probability of delivery within x days of a given date
Length of pregnancy by week
Spontaneous labor and due date determination
Length of pregnancy, comparing subsequent births for individual moms
Length of pregnancy for first time vs. second & third time moms
Length of pregnancy, type of delivery
Gestation vs. Birthweight
Probablity of Induction after a given day
Average day of spontaneous labor vs. age of mother at time of birth
Are more babies born during a full moon?
What's the most common day of the week for babies to be born?
I'm still pregnant at 40W. What's it mean?
Do winter babies arrive later?
What if I know my conception date?
Are boys or girls born later?
Subsequent pregnancy date search
How do inductions bias the due date statistics?
Download the data
Survey input dates
More ResourcesPregnancy Day-by-Day
Fast pregnancy calendar
Baby age calendar
EDD Icon Generator
Jo's Birth Story
Weeks vs. Months Explained
Charts generated by flot