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 10950 2710
Unscheduled Cesarean 1033 647
Scheduled Cesarean 104 296

Excluding scheduled cesareans from the table above, there were 11983 spontaneous labors and 3357 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 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 41 18 3 10   6   38%   2   31   12   28%   1  
253 32 12 0 6   7   54%     26   5   16%    
254 45 9 1 8   3   27%     37   6   14%   1  
255 44 9 1 5   2   29%     39   7   15%   1  
256 41 4 3 6   2   25%   1   35   2   5%   2  
257 52 5 3 7   2   22%   2   45   3   6%   1  
258 67 8 3 14   2   13%   2   53   6   10%   1  
259 101 17 10 27   8   23%   6   74   9   11%   4  
260 99 12 6 25   3   11%   3   74   9   11%   3  
261 100 8 8 24   4   14%   4   76   4   5%   4  
262 94 23 5 16   5   24%   3   78   18   19%   2  
263 119 21 3 22   4   15%     97   17   15%   3  
264 112 21 8 16   4   20%   6   96   17   15%   2  
265 163 13 7 21   3   13%   5   142   10   7%   2  
266 222 17 10 49   5   9%   5   173   12   6%   5  
267 189 21 4 41   11   21%   3   148   10   6%   1  
268 198 17 9 38   6   14%   8   160   11   6%   1  
269 227 26 9 29   4   12%   8   198   22   10%   1  
270 300 35 9 50   7   12%   4   250   28   10%   5  
271 270 29 15 39   8   17%   12   231   21   8%   3  
272 320 32 21 50   14   22%   11   270   18   6%   10  
273 440 51 42 119   16   12%   36   321   35   10%   6  
274 393 40 36 85   16   16%   33   308   24   7%   3  
275 546 30 19 69   11   14%   12   477   19   4%   7  
276 504 45 17 76   22   22%   16   428   23   5%   1  
277 500 54 12 71   24   25%   8   429   30   7%   4  
278 504 38 10 73   12   14%   6   431   26   6%   4  
279 518 73 8 50   17   25%   5   468   56   11%   3  
280 1055 112 28 134   37   22%   15   921   75   8%   13  
281 639 56 6 82   12   13%   6   557   44   7%    
282 562 64 11 83   18   18%   11   479   46   9%    
283 542 50 8 82   18   18%   5   460   32   7%   3  
284 503 62 9 94   24   20%   8   409   38   9%   1  
285 520 68 1 85   17   17%   1   435   51   10%    
286 529 69 7 97   27   22%   6   432   42   9%   1  
287 590 75 7 155   31   17%   7   435   44   9%    
288 461 70 8 130   34   21%   8   331   36   10%    
289 384 45 9 114   22   16%   7   270   23   8%   2  
290 379 58 4 119   36   23%   3   260   22   8%   1  
291 275 45 6 97   21   18%   6   178   24   12%    
292 216 43 0 95   16   14%     121   27   18%    
293 196 24 2 77   13   14%   2   119   11   8%    
294 160 43 2 79   30   28%   2   81   13   14%    
295 99 17 2 60   14   19%   2   39   3   7%    
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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