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 11044 2776
Unscheduled Cesarean 1047 658
Scheduled Cesarean 110 300

Excluding scheduled cesareans from the table above, there were 12091 spontaneous labors and 3434 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 48 10 1 8   4   33%     40   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 68 8 3 14   2   13%   2   54   6   10%   1  
259 103 17 10 28   8   22%   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  
264 117 22 9 18   5   22%   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  
267 197 21 4 43   11   20%   3   154   10   6%   1  
268 203 17 10 38   6   14%   9   165   11   6%   1  
269 234 26 9 31   4   11%   8   203   22   10%   1  
270 305 35 9 51   7   12%   4   254   28   10%   5  
271 277 30 16 40   8   17%   13   237   22   8%   3  
272 328 32 21 50   14   22%   11   278   18   6%   10  
273 450 51 43 121   16   12%   37   329   35   10%   6  
274 400 40 37 86   16   16%   34   314   24   7%   3  
275 390 30 19 70   11   14%   12   320   19   6%   7  
276 515 46 17 78   22   22%   16   437   24   5%   1  
277 507 54 12 71   24   25%   8   436   30   6%   4  
278 515 39 10 75   12   14%   6   440   27   6%   4  
279 532 73 8 52   17   25%   5   480   56   10%   3  
280 1081 114 30 138   37   21%   15   943   77   8%   15  
281 655 57 6 87   12   12%   6   568   45   7%    
282 572 65 11 83   18   18%   11   489   47   9%    
283 557 51 8 84   19   18%   5   473   32   6%   3  
284 516 62 9 97   24   20%   8   419   38   8%   1  
285 525 69 1 86   18   17%   1   439   51   10%    
286 539 70 7 98   28   22%   6   441   42   9%   1  
287 605 75 7 159   31   16%   7   446   44   9%    
288 471 71 8 134   35   21%   8   337   36   10%    
289 394 46 9 115   23   17%   7   279   23   8%   2  
290 390 60 4 121   36   23%   3   269   24   8%   1  
291 280 48 6 98   22   18%   6   182   26   13%    
292 227 43 0 99   16   14%     128   27   17%    
293 201 24 2 77   13   14%   2   124   11   8%    
294 163 44 2 81   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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