Length of pregnancy, type of delivery

[ Survey Results Intro | All Charts | Take the survey ]

This chart shows types of delivery on each day by percentage, based on the total births in the survey.

Does induction increase my odds of having a cesarean?

 Spontaneous LaborInduced Labor
Vaginal 11140 2804
Unscheduled Cesarean 1050 665
Scheduled Cesarean 111 302

Excluding scheduled cesareans from the table above, there were 12190 spontaneous labors and 3469 inductions. 9% of the spontaneous labors ended in cesarean and 19% of the inductions ended in cesarean.

Some people have looked at these numbers, and the fact that there seems to be an increase in cesareans after 40W0D, and wondered if there's a correlation. In other words, do "timeline-based" inductions lead to increased cesareans? That analysis gets tricky, so I'll just post the numbers and let you decide yourself what's going on.
DayTotalFollowing inductionsFollowing spontaneous labor
Vaginal
Births
Unscheduled
Cesareans
Scheduled
Cesareans
Vaginal
Births
Unscheduled
Cesareans
% Unscheduled
Cesareans
Scheduled
Cesareans
Vaginal
Births
Unscheduled
Cesareans
% Unscheduled
Cesareans
Scheduled
Cesareans
245 17 10 3 1   3   75%   3   16   7   30%    
246 20 7 0 2   2   50%     18   5   22%    
247 19 5 0 1   1   50%     18   4   18%    
248 25 8 2 5   4   44%   1   20   4   17%   1  
249 22 15 0 3   10   77%     19   5   21%    
250 32 5 0 6   4   40%     26   1   4%    
251 26 1 0 2     0%     24   1   4%    
252 43 18 3 10   6   38%   2   33   12   27%   1  
253 32 12 0 6   7   54%     26   5   16%    
254 48 10 1 8   4   33%     40   6   13%   1  
255 46 10 2 6   3   33%     40   7   15%   2  
256 43 4 3 7   2   22%   1   36   2   5%   2  
257 55 5 3 8   2   20%   2   47   3   6%   1  
258 68 8 3 14   2   13%   2   54   6   10%   1  
259 104 17 10 28   8   22%   6   76   9   11%   4  
260 105 13 7 28   4   13%   3   77   9   10%   4  
261 105 8 9 28   4   13%   5   77   4   5%   4  
262 94 23 5 16   5   24%   3   78   18   19%   2  
263 126 21 3 22   4   15%     104   17   14%   3  
264 118 22 9 18   5   22%   6   100   17   15%   3  
265 168 14 7 21   3   13%   5   147   11   7%   2  
266 237 18 11 56   6   10%   5   181   12   6%   6  
267 204 21 4 45   11   20%   3   159   10   6%   1  
268 205 18 10 39   7   15%   9   166   11   6%   1  
269 236 26 9 31   4   11%   8   205   22   10%   1  
270 308 35 9 51   7   12%   4   257   28   10%   5  
271 279 30 16 40   8   17%   13   239   22   8%   3  
272 333 32 21 50   14   22%   11   283   18   6%   10  
273 455 53 43 123   18   13%   37   332   35   10%   6  
274 407 41 37 88   17   16%   34   319   24   7%   3  
275 395 30 19 71   11   13%   12   324   19   6%   7  
276 516 46 18 78   22   22%   16   438   24   5%   2  
277 513 55 12 72   25   26%   8   441   30   6%   4  
278 519 40 10 75   12   14%   6   444   28   6%   4  
279 535 73 8 52   17   25%   5   483   56   10%   3  
280 1092 114 30 140   37   21%   15   952   77   7%   15  
281 659 58 7 88   12   12%   7   571   46   7%    
282 578 65 11 85   18   17%   11   493   47   9%    
283 560 52 8 84   19   18%   5   476   33   6%   3  
284 518 62 9 97   24   20%   8   421   38   8%   1  
285 528 69 1 88   18   17%   1   440   51   10%    
286 542 70 7 99   28   22%   6   443   42   9%   1  
287 608 75 7 159   31   16%   7   449   44   9%    
288 476 71 8 135   35   21%   8   341   36   10%    
289 398 46 9 117   23   16%   7   281   23   8%   2  
290 391 60 4 121   36   23%   3   270   24   8%   1  
291 284 48 6 100   22   18%   6   184   26   12%    
292 229 43 0 100   16   14%     129   27   17%    
293 202 24 2 77   13   14%   2   125   11   8%    
294 164 44 2 81   30   27%   2   83   14   14%    
295 101 17 2 60   14   19%   2   41   3   7%    
296 56 13 1 27   10   27%   1   29   3   9%    
297 36 13 0 13   8   38%     23   5   18%    
298 18 4 0 8   1   11%     10   3   23%    
299 19 6 1 6   4   40%   1   13   2   13%    
300 12 2 0 3   1   25%     9   1   10%    

Due Date Survey Data

Due 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
Birth Stories
Survey input dates

More Resources

Pregnancy Day-by-Day
Fast pregnancy calendar
Baby age calendar
EDD Icon Generator
Jo's Birth Story
Weeks vs. Months Explained
Charts generated by flot
spacefem.com
spacefem@spacefem.com