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 10793 2693
Unscheduled Cesarean 1031 641
Scheduled Cesarean 102 294

Excluding scheduled cesareans from the table above, there were 11824 spontaneous labors and 3334 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 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 67 8 3 14   2   13%   2   53   6   10%   1  
259 101 17 10 27   8   23%   6   74   9   11%   4  
260 96 12 6 24   3   11%   3   72   9   11%   3  
261 99 8 8 24   4   14%   4   75   4   5%   4  
262 93 23 5 16   5   24%   3   77   18   19%   2  
263 117 21 3 21   4   16%     96   17   15%   3  
264 112 21 8 16   4   20%   6   96   17   15%   2  
265 161 13 7 21   3   13%   5   140   10   7%   2  
266 220 17 9 49   5   9%   5   171   12   7%   4  
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  
270 297 35 9 48   7   13%   4   249   28   10%   5  
271 269 29 15 38   8   17%   12   231   21   8%   3  
272 319 32 21 50   14   22%   11   269   18   6%   10  
273 438 51 42 117   16   12%   36   321   35   10%   6  
274 392 40 36 85   16   16%   33   307   24   7%   3  
275 445 30 18 69   11   14%   11   376   19   5%   7  
276 499 45 16 75   22   23%   15   424   23   5%   1  
277 496 54 12 70   24   26%   8   426   30   7%   4  
278 504 38 10 73   12   14%   6   431   26   6%   4  
279 515 73 8 50   17   25%   5   465   56   11%   3  
280 1048 112 28 134   37   22%   15   914   75   8%   13  
281 638 53 6 82   10   11%   6   556   43   7%    
282 559 63 11 82   17   17%   11   477   46   9%    
283 535 50 8 82   18   18%   5   453   32   7%   3  
284 501 62 9 94   24   20%   8   407   38   9%   1  
285 519 68 1 85   17   17%   1   434   51   11%    
286 529 69 7 97   27   22%   6   432   42   9%   1  
287 585 75 7 154   31   17%   7   431   44   9%    
288 459 69 8 129   34   21%   8   330   35   10%    
289 379 45 8 112   22   16%   7   267   23   8%   1  
290 376 57 4 118   35   23%   3   258   22   8%   1  
291 274 45 6 96   21   18%   6   178   24   12%    
292 216 42 0 95   15   14%     121   27   18%    
293 195 24 2 76   13   15%   2   119   11   8%    
294 160 43 2 79   30   28%   2   81   13   14%    
295 99 16 2 60   13   18%   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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