Probability of delivery resulting from spontaneous labor after 34 weeks

The most important question I was trying to answer with the survey was this: "When is a baby most likely to spontaneously show up?" The graph above shows the percentages, based on 17109 responses. 13375 of the deliveries were as a result of labor occuring spontaneously. The chart only shows these deliveries, which is why the percentages do not add up to 100%, because only 78% of participants had spontaneous (non-induced) labor.

The statistics right now are as follows:

Data Table

Day Week Births Running Total Percent Running Total % 238 34W,0D 16 16 0.1 % 0.1 % 239 34W,1D 21 37 0.1 % 0.2 % 240 34W,2D 10 47 0.1 % 0.3 % 241 34W,3D 8 55 0 % 0.3 % 242 34W,4D 8 63 0 % 0.4 % 243 34W,5D 14 77 0.1 % 0.5 % 244 34W,6D 647 724 3.8 % 4.2 % 245 35W,0D 22 746 0.1 % 4.4 % 246 35W,1D 21 767 0.1 % 4.5 % 247 35W,2D 22 789 0.1 % 4.6 % 248 35W,3D 25 814 0.1 % 4.8 % 249 35W,4D 24 838 0.1 % 4.9 % 250 35W,5D 27 865 0.2 % 5.1 % 251 35W,6D 25 890 0.1 % 5.2 % 252 36W,0D 45 935 0.3 % 5.5 % 253 36W,1D 31 966 0.2 % 5.6 % 254 36W,2D 44 1010 0.3 % 5.9 % 255 36W,3D 48 1058 0.3 % 6.2 % 256 36W,4D 39 1097 0.2 % 6.4 % 257 36W,5D 51 1148 0.3 % 6.7 % 258 36W,6D 60 1208 0.4 % 7.1 % 259 37W,0D 87 1295 0.5 % 7.6 % 260 37W,1D 88 1383 0.5 % 8.1 % 261 37W,2D 84 1467 0.5 % 8.6 % 262 37W,3D 98 1565 0.6 % 9.1 % 263 37W,4D 123 1688 0.7 % 9.9 % 264 37W,5D 116 1804 0.7 % 10.5 % 265 37W,6D 158 1962 0.9 % 11.5 % 266 38W,0D 191 2153 1.1 % 12.6 % 267 38W,1D 160 2313 0.9 % 13.5 % 268 38W,2D 175 2488 1 % 14.5 % 269 38W,3D 223 2711 1.3 % 15.8 % 270 38W,4D 284 2995 1.7 % 17.5 % 271 38W,5D 259 3254 1.5 % 19 % 272 38W,6D 303 3557 1.8 % 20.8 % 273 39W,0D 363 3920 2.1 % 22.9 % 274 39W,1D 339 4259 2 % 24.9 % 275 39W,2D 921 5180 5.4 % 30.3 % 276 39W,3D 459 5639 2.7 % 33 % 277 39W,4D 465 6104 2.7 % 35.7 % 278 39W,5D 466 6570 2.7 % 38.4 % 279 39W,6D 534 7104 3.1 % 41.5 % 280 40W,0D 1027 8131 6 % 47.5 % 281 40W,1D 606 8737 3.5 % 51.1 % 282 40W,2D 532 9269 3.1 % 54.2 % 283 40W,3D 502 9771 2.9 % 57.1 % 284 40W,4D 452 10223 2.6 % 59.8 % 285 40W,5D 490 10713 2.9 % 62.6 % 286 40W,6D 483 11196 2.8 % 65.4 % 287 41W,0D 486 11682 2.8 % 68.3 % 288 41W,1D 370 12052 2.2 % 70.4 % 289 41W,2D 298 12350 1.7 % 72.2 % 290 41W,3D 289 12639 1.7 % 73.9 % 291 41W,4D 206 12845 1.2 % 75.1 % 292 41W,5D 151 12996 0.9 % 76 % 293 41W,6D 131 13127 0.8 % 76.7 % 294 42W,0D 96 13223 0.6 % 77.3 % 295 42W,1D 42 13265 0.2 % 77.5 % 296 42W,2D 31 13296 0.2 % 77.7 % 297 42W,3D 28 13324 0.2 % 77.9 % 298 42W,4D 13 13337 0.1 % 78 % 299 42W,5D 15 13352 0.1 % 78 % 300 42W,6D 10 13362 0.1 % 78.1 % 301 43W,0D 13 13375 0.1 % 78.2 %

The percentages are based on ALL births (including inductions)