Probability of delivery resulting from spontaneous labor after 35 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 16341 responses. 12651 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 77% of participants had spontaneous (non-induced) labor.

The statistics right now are as follows:

Data Table

Day Week Births Running Total Percent Running Total % 245 35W,0D 22 22 0.1 % 0.1 % 246 35W,1D 21 43 0.1 % 0.3 % 247 35W,2D 22 65 0.1 % 0.4 % 248 35W,3D 25 90 0.2 % 0.6 % 249 35W,4D 24 114 0.1 % 0.7 % 250 35W,5D 27 141 0.2 % 0.9 % 251 35W,6D 25 166 0.2 % 1 % 252 36W,0D 45 211 0.3 % 1.3 % 253 36W,1D 31 242 0.2 % 1.5 % 254 36W,2D 44 286 0.3 % 1.8 % 255 36W,3D 48 334 0.3 % 2 % 256 36W,4D 39 373 0.2 % 2.3 % 257 36W,5D 51 424 0.3 % 2.6 % 258 36W,6D 60 484 0.4 % 3 % 259 37W,0D 87 571 0.5 % 3.5 % 260 37W,1D 88 659 0.5 % 4 % 261 37W,2D 84 743 0.5 % 4.5 % 262 37W,3D 98 841 0.6 % 5.1 % 263 37W,4D 123 964 0.8 % 5.9 % 264 37W,5D 116 1080 0.7 % 6.6 % 265 37W,6D 158 1238 1 % 7.6 % 266 38W,0D 191 1429 1.2 % 8.7 % 267 38W,1D 160 1589 1 % 9.7 % 268 38W,2D 175 1764 1.1 % 10.8 % 269 38W,3D 223 1987 1.4 % 12.2 % 270 38W,4D 284 2271 1.7 % 13.9 % 271 38W,5D 259 2530 1.6 % 15.5 % 272 38W,6D 303 2833 1.9 % 17.3 % 273 39W,0D 363 3196 2.2 % 19.6 % 274 39W,1D 339 3535 2.1 % 21.6 % 275 39W,2D 921 4456 5.6 % 27.3 % 276 39W,3D 459 4915 2.8 % 30.1 % 277 39W,4D 465 5380 2.8 % 32.9 % 278 39W,5D 466 5846 2.9 % 35.8 % 279 39W,6D 534 6380 3.3 % 39 % 280 40W,0D 1027 7407 6.3 % 45.3 % 281 40W,1D 606 8013 3.7 % 49 % 282 40W,2D 532 8545 3.3 % 52.3 % 283 40W,3D 502 9047 3.1 % 55.4 % 284 40W,4D 452 9499 2.8 % 58.1 % 285 40W,5D 490 9989 3 % 61.1 % 286 40W,6D 483 10472 3 % 64.1 % 287 41W,0D 486 10958 3 % 67.1 % 288 41W,1D 370 11328 2.3 % 69.3 % 289 41W,2D 298 11626 1.8 % 71.1 % 290 41W,3D 289 11915 1.8 % 72.9 % 291 41W,4D 206 12121 1.3 % 74.2 % 292 41W,5D 151 12272 0.9 % 75.1 % 293 41W,6D 131 12403 0.8 % 75.9 % 294 42W,0D 96 12499 0.6 % 76.5 % 295 42W,1D 42 12541 0.3 % 76.7 % 296 42W,2D 31 12572 0.2 % 76.9 % 297 42W,3D 28 12600 0.2 % 77.1 % 298 42W,4D 13 12613 0.1 % 77.2 % 299 42W,5D 15 12628 0.1 % 77.3 % 300 42W,6D 10 12638 0.1 % 77.3 % 301 43W,0D 13 12651 0.1 % 77.4 %

The percentages are based on ALL births (including inductions)