Table 3. Birth, (estimated) conception distribution and circular statistics for the births at 15 sites (13 captive and two free-ranging) in China that had more than 12 births recorded.
| Birth | Conception | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sites | Mean vector (μ) | Mean group | Length of mean vector (r) | Median | Median group | Mean vector (μ) | Mean group | Length of mean vector (r) | Median | Median group | Concen tration | Circular variance | Circular standard deviation | Standard error of mean | Rayleigh test (Z) | Rayleigh test (p) |
| Free-ranging groups | ||||||||||||||||
| Shennongjia | 104.203 | 106 | 0.953 | 104.055 | 106 | 264.97 | 269 | 0.953 | 264.822 | 269 | 10.856 | 0.047 | 17.822 | 2.245 | 57.19 | <0.001 |
| Qingling | 101.37 | 103 | 0.967 | 101.096 | 103 | 262.14 | 266 | 0.967 | 261.863 | 266 | 15.595 | 0.033 | 14.754 | 1.889 | 57.086 | <0.001 |
| Captive groups | ||||||||||||||||
| Guangzhou | 97.11 | 99 | 0.814 | 105.041 | 107 | 257.88 | 262 | 0.814 | 265.808 | 270 | 2.324 | 0.186 | 36.804 | 12.03 | 7.943 | <0.001 |
| Hangzhou | 97.485 | 99 | 0.901 | 96.164 | 98 | 258.25 | 262 | 0.901 | 256.932 | 261 | 5.357 | 0.099 | 26.118 | 5.982 | 15.435 | <0.001 |
| Chengdu | 101.476 | 103 | 0.738 | 118.356 | 121 | 262.24 | 266 | 0.738 | 279.123 | 284 | 2.263 | 0.262 | 44.709 | 10.45 | 9.791 | <0.001 |
| Tongling | 112.517 | 115 | 0.991 | 113.918 | 116 | 273.28 | 278 | 0.991 | 274.685 | 279 | 56.424 | 0.009 | 7.662 | 0.95 | 63.848 | <0.001 |
| Shanghai | 111.886 | 114 | 0.864 | 111.945 | 114 | 272.65 | 277 | 0.864 | 272.712 | 277 | 3.981 | 0.136 | 30.993 | 3.521 | 57.466 | <0.001 |
| Louguangtai | 106.349 | 108 | 0.943 | 103.068 | 105 | 267.12 | 271 | 0.943 | 263.836 | 268 | 8.974 | 0.057 | 19.712 | 4.52 | 16.879 | <0.001 |
| Xi’an | 97.935 | 100 | 0.956 | 92.219 | 94 | 258.7 | 263 | 0.956 | 252.986 | 257 | 11.52 | 0.044 | 17.275 | 4.07 | 16.436 | <0.001 |
| Lanzhou | 97.574 | 99 | 0.955 | 99.123 | 101 | 258.34 | 262 | 0.955 | 259.89 | 264 | 11.386 | 0.045 | 17.381 | 3.792 | 19.154 | <0.001 |
| Jinan | 102.446 | 104 | 0.857 | 92.219 | 94 | 263.21 | 267 | 0.857 | 252.986 | 257 | 3.819 | 0.143 | 31.773 | 7.679 | 12.499 | <0.001 |
| Xixiakou | 141.222 | 144 | 0.896 | 133.151 | 135 | 302.05 | 307 | 0.896 | 293.918 | 298 | 5.117 | 0.104 | 26.803 | 6.306 | 14.462 | <0.001 |
| Gansu ERC | 116.927 | 119 | 0.935 | 105.041 | 107 | 277.69 | 282 | 0.935 | 265.808 | 270 | 6.196 | 0.065 | 21.069 | 6.604 | 11.356 | <0.001 |
| Beijing | 113.126 | 115 | 0.778 | 108.986 | 111 | 273.89 | 278 | 0.778 | 269.753 | 274 | 2.615 | 0.222 | 40.632 | 4.166 | 56.243 | <0.001 |
| Haerbing | 116.254 | 118 | 0.934 | 113.918 | 116 | 277.02 | 281 | 0.934 | 274.685 | 279 | 7.816 | 0.066 | 21.225 | 5.144 | 14.82 | <0.001 |