Length of pregnancy, type of delivery

[ Survey Results Intro | All Charts | Take the survey ]

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 11119 2721
Unscheduled Cesarean 1040 649
Scheduled Cesarean 105 298

Excluding scheduled cesareans from the table above, there were 12159 spontaneous labors and 3370 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 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  
265 164 13 7 21   3   13%   5   143   10   7%   2  
266 222 17 10 49   5   9%   5   173   12   6%   5  
267 189 21 4 41   11   21%   3   148   10   6%   1  
268 198 17 9 38   6   14%   8   160   11   6%   1  
269 229 26 9 29   4   12%   8   200   22   10%   1  
270 300 35 9 50   7   12%   4   250   28   10%   5  
271 272 29 15 40   8   17%   12   232   21   8%   3  
272 324 32 21 50   14   22%   11   274   18   6%   10  
273 442 51 43 120   16   12%   37   322   35   10%   6  
274 395 40 37 85   16   16%   34   310   24   7%   3  
275 650 30 19 69   11   14%   12   581   19   3%   7  
276 507 46 17 76   22   22%   16   431   24   5%   1  
277 501 54 12 71   24   25%   8   430   30   7%   4  
278 507 38 10 73   12   14%   6   434   26   6%   4  
279 522 73 8 50   17   25%   5   472   56   11%   3  
280 1063 112 29 135   37   22%   15   928   75   7%   14  
281 643 57 6 82   12   13%   6   561   45   7%    
282 566 65 11 83   18   18%   11   483   47   9%    
283 547 50 8 83   18   18%   5   464   32   6%   3  
284 506 62 9 94   24   20%   8   412   38   8%   1  
285 520 68 1 85   17   17%   1   435   51   10%    
286 533 69 7 97   27   22%   6   436   42   9%   1  
287 593 75 7 155   31   17%   7   438   44   9%    
288 463 70 8 132   34   20%   8   331   36   10%    
289 385 45 9 114   22   16%   7   271   23   8%   2  
290 383 60 4 120   36   23%   3   263   24   8%   1  
291 278 46 6 97   21   18%   6   181   25   12%    
292 218 43 0 96   16   14%     122   27   18%    
293 197 24 2 77   13   14%   2   120   11   8%    
294 160 44 2 79   30   28%   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 18 6 1 6   4   40%   1   12   2   14%    
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
spacefem.com
spacefem@spacefem.com