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 11001 2761
Unscheduled Cesarean 1045 656
Scheduled Cesarean 110 300

Excluding scheduled cesareans from the table above, there were 12046 spontaneous labors and 3417 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 19 7 0 2   2   50%     17   5   23%    
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 42 18 3 10   6   38%   2   32   12   27%   1  
253 32 12 0 6   7   54%     26   5   16%    
254 47 10 1 8   4   33%     39   6   13%   1  
255 45 9 2 5   2   29%     40   7   15%   2  
256 43 4 3 7   2   22%   1   36   2   5%   2  
257 54 5 3 7   2   22%   2   47   3   6%   1  
258 67 8 3 14   2   13%   2   53   6   10%   1  
259 102 17 10 27   8   23%   6   75   9   11%   4  
260 102 12 7 27   3   10%   3   75   9   11%   4  
261 104 8 8 27   4   13%   4   77   4   5%   4  
262 94 23 5 16   5   24%   3   78   18   19%   2  
263 125 21 3 22   4   15%     103   17   14%   3  
264 115 22 9 16   5   24%   6   99   17   15%   3  
265 167 14 7 21   3   13%   5   146   11   7%   2  
266 232 18 11 55   6   10%   5   177   12   6%   6  
267 193 21 4 43   11   20%   3   150   10   6%   1  
268 202 17 10 38   6   14%   9   164   11   6%   1  
269 231 26 9 30   4   12%   8   201   22   10%   1  
270 304 35 9 51   7   12%   4   253   28   10%   5  
271 276 29 16 40   8   17%   13   236   21   8%   3  
272 328 32 21 50   14   22%   11   278   18   6%   10  
273 449 51 43 121   16   12%   37   328   35   10%   6  
274 399 40 37 86   16   16%   34   313   24   7%   3  
275 389 30 19 70   11   14%   12   319   19   6%   7  
276 513 46 17 77   22   22%   16   436   24   5%   1  
277 505 54 12 71   24   25%   8   434   30   6%   4  
278 512 39 10 74   12   14%   6   438   27   6%   4  
279 529 73 8 52   17   25%   5   477   56   11%   3  
280 1076 113 30 136   37   21%   15   940   76   7%   15  
281 653 57 6 86   12   12%   6   567   45   7%    
282 571 65 11 83   18   18%   11   488   47   9%    
283 554 51 8 84   19   18%   5   470   32   6%   3  
284 513 62 9 97   24   20%   8   416   38   8%   1  
285 525 68 1 86   17   17%   1   439   51   10%    
286 537 70 7 97   28   22%   6   440   42   9%   1  
287 601 75 7 158   31   16%   7   443   44   9%    
288 469 71 8 133   35   21%   8   336   36   10%    
289 391 46 9 114   23   17%   7   277   23   8%   2  
290 389 60 4 121   36   23%   3   268   24   8%   1  
291 279 47 6 97   21   18%   6   182   26   13%    
292 226 43 0 99   16   14%     127   27   18%    
293 200 24 2 77   13   14%   2   123   11   8%    
294 162 44 2 80   30   27%   2   82   14   15%    
295 100 17 2 60   14   19%   2   40   3   7%    
296 55 13 1 27   10   27%   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 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
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