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 11303 2731
Unscheduled Cesarean 1041 650
Scheduled Cesarean 105 298

Excluding scheduled cesareans from the table above, there were 12344 spontaneous labors and 3381 inductions. 8% 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 10 1 8   4   33%     37   6   14%   1  
255 44 9 1 5   2   29%     39   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 99 12 6 25   3   11%   3   74   9   11%   3  
261 102 8 8 26   4   13%   4   76   4   5%   4  
262 94 23 5 16   5   24%   3   78   18   19%   2  
263 121 21 3 22   4   15%     99   17   15%   3  
264 112 22 8 16   5   24%   6   96   17   15%   2  
265 165 13 7 21   3   13%   5   144   10   6%   2  
266 222 17 10 49   5   9%   5   173   12   6%   5  
267 190 21 4 41   11   21%   3   149   10   6%   1  
268 199 17 9 38   6   14%   8   161   11   6%   1  
269 229 26 9 29   4   12%   8   200   22   10%   1  
270 300 35 9 50   7   12%   4   250   28   10%   5  
271 273 29 15 40   8   17%   12   233   21   8%   3  
272 325 32 21 50   14   22%   11   275   18   6%   10  
273 442 51 43 120   16   12%   37   322   35   10%   6  
274 396 40 37 85   16   16%   34   311   24   7%   3  
275 807 30 19 69   11   14%   12   738   19   3%   7  
276 507 46 17 76   22   22%   16   431   24   5%   1  
277 502 54 12 71   24   25%   8   431   30   7%   4  
278 509 38 10 74   12   14%   6   435   26   6%   4  
279 524 73 8 51   17   25%   5   473   56   11%   3  
280 1070 113 29 135   37   22%   15   935   76   8%   14  
281 644 57 6 83   12   13%   6   561   45   7%    
282 567 65 11 83   18   18%   11   484   47   9%    
283 549 50 8 84   18   18%   5   465   32   6%   3  
284 508 62 9 96   24   20%   8   412   38   8%   1  
285 522 68 1 86   17   17%   1   436   51   10%    
286 535 69 7 97   27   22%   6   438   42   9%   1  
287 593 75 7 155   31   17%   7   438   44   9%    
288 466 70 8 133   34   20%   8   333   36   10%    
289 386 46 9 114   23   17%   7   272   23   8%   2  
290 384 60 4 121   36   23%   3   263   24   8%   1  
291 278 46 6 97   21   18%   6   181   25   12%    
292 219 43 0 96   16   14%     123   27   18%    
293 197 24 2 77   13   14%   2   120   11   8%    
294 161 44 2 80   30   27%   2   81   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
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