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 2750
Unscheduled Cesarean 1045 652
Scheduled Cesarean 108 298

Excluding scheduled cesareans from the table above, there were 11995 spontaneous labors and 3402 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 16 9 3 1   2   67%   3   15   7   32%    
246 18 7 0 1   2   67%     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 1 5   2   29%     40   7   15%   1  
256 42 4 3 7   2   22%   1   35   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  
259 101 17 10 27   8   23%   6   74   9   11%   4  
260 101 12 7 26   3   10%   3   75   9   11%   4  
261 103 8 8 27   4   13%   4   76   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  
264 113 22 8 16   5   24%   6   97   17   15%   2  
265 167 14 7 21   3   13%   5   146   11   7%   2  
266 230 17 11 55   5   8%   5   175   12   6%   6  
267 192 21 4 43   11   20%   3   149   10   6%   1  
268 201 17 9 38   6   14%   8   163   11   6%   1  
269 231 26 9 30   4   12%   8   201   22   10%   1  
270 302 35 9 51   7   12%   4   251   28   10%   5  
271 275 29 15 40   8   17%   12   235   21   8%   3  
272 328 32 21 50   14   22%   11   278   18   6%   10  
273 444 51 43 120   16   12%   37   324   35   10%   6  
274 397 40 37 85   16   16%   34   312   24   7%   3  
275 387 30 19 69   11   14%   12   318   19   6%   7  
276 510 46 17 76   22   22%   16   434   24   5%   1  
277 503 54 12 71   24   25%   8   432   30   6%   4  
278 510 39 10 74   12   14%   6   436   27   6%   4  
279 527 73 8 51   17   25%   5   476   56   11%   3  
280 1073 113 30 135   37   22%   15   938   76   7%   15  
281 649 57 6 85   12   12%   6   564   45   7%    
282 569 65 11 83   18   18%   11   486   47   9%    
283 554 50 8 84   18   18%   5   470   32   6%   3  
284 511 62 9 97   24   20%   8   414   38   8%   1  
285 525 68 1 86   17   17%   1   439   51   10%    
286 536 70 7 97   28   22%   6   439   42   9%   1  
287 599 75 7 157   31   16%   7   442   44   9%    
288 468 71 8 133   35   21%   8   335   36   10%    
289 387 46 9 114   23   17%   7   273   23   8%   2  
290 385 60 4 121   36   23%   3   264   24   8%   1  
291 279 47 6 97   21   18%   6   182   26   13%    
292 223 43 0 98   16   14%     125   27   18%    
293 198 24 2 77   13   14%   2   121   11   8%    
294 162 44 2 80   30   27%   2   82   14   15%    
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 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
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