Length of pregnancy, type of delivery

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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 10632 2673
Unscheduled Cesarean 1023 637
Scheduled Cesarean 100 292

Excluding scheduled cesareans from the table above, there were 11655 spontaneous labors and 3310 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 15 9 3 1   2   67%   3   14   7   33%    
246 18 6 0 1   2   67%     17   4   19%    
247 18 5 0 1   1   50%     17   4   19%    
248 25 8 2 5   4   44%   1   20   4   17%   1  
249 22 15 0 3   10   77%     19   5   21%    
250 31 5 0 6   4   40%     25   1   4%    
251 24 1 0 2     0%     22   1   4%    
252 41 18 3 10   6   38%   2   31   12   28%   1  
253 31 12 0 6   7   54%     25   5   17%    
254 45 9 1 8   3   27%     37   6   14%   1  
255 44 9 1 5   2   29%     39   7   15%   1  
256 39 4 3 6   2   25%   1   33   2   6%   2  
257 51 5 3 7   2   22%   2   44   3   6%   1  
258 66 8 3 14   2   13%   2   52   6   10%   1  
259 101 16 10 27   7   21%   6   74   9   11%   4  
260 96 12 5 24   3   11%   3   72   9   11%   2  
261 98 8 7 24   4   14%   3   74   4   5%   4  
262 93 23 5 16   5   24%   3   77   18   19%   2  
263 116 21 3 21   4   16%     95   17   15%   3  
264 111 20 8 16   4   20%   6   95   16   14%   2  
265 160 13 7 21   3   13%   5   139   10   7%   2  
266 211 17 9 48   5   9%   5   163   12   7%   4  
267 188 21 4 41   11   21%   3   147   10   6%   1  
268 198 17 9 38   6   14%   8   160   11   6%   1  
269 226 26 8 29   4   12%   7   197   22   10%   1  
270 294 34 9 47   6   11%   4   247   28   10%   5  
271 265 29 15 37   8   18%   12   228   21   8%   3  
272 318 32 21 50   14   22%   11   268   18   6%   10  
273 435 51 42 115   16   12%   36   320   35   10%   6  
274 386 40 36 84   16   16%   33   302   24   7%   3  
275 383 30 18 69   11   14%   11   314   19   6%   7  
276 496 43 16 75   22   23%   15   421   21   5%   1  
277 493 54 12 70   24   26%   8   423   30   7%   4  
278 500 38 10 73   12   14%   6   427   26   6%   4  
279 512 72 8 50   16   24%   5   462   56   11%   3  
280 1039 111 27 133   37   22%   15   906   74   8%   12  
281 631 53 6 81   10   11%   6   550   43   7%    
282 554 63 11 82   17   17%   11   472   46   9%    
283 530 50 8 81   18   18%   5   449   32   7%   3  
284 494 62 9 93   24   21%   8   401   38   9%   1  
285 513 68 1 84   17   17%   1   429   51   11%    
286 527 69 7 97   27   22%   6   430   42   9%   1  
287 576 74 7 151   31   17%   7   425   43   9%    
288 455 68 8 128   34   21%   8   327   34   9%    
289 374 44 8 109   22   17%   7   265   22   8%   1  
290 375 56 4 118   34   22%   3   257   22   8%   1  
291 272 44 6 96   21   18%   6   176   23   12%    
292 214 42 0 95   15   14%     119   27   18%    
293 194 24 2 75   13   15%   2   119   11   8%    
294 159 43 2 79   30   28%   2   80   13   14%    
295 96 16 2 59   13   18%   2   37   3   8%    
296 55 12 1 27   9   25%   1   28   3   10%    
297 36 13 0 13   8   38%     23   5   18%    
298 18 4 0 8   1   11%     10   3   23%    
299 17 6 1 6   4   40%   1   11   2   15%    
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
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