condition mean min max ZT0-3 9.929998333333334 6.617395 15.56475 ZT4-7 14.14245 14.14245 14.14245 ZT8-11 7.950075 7.950075 7.950075 ZT12-15 10.63871 8.69312 12.5843 ZT16-19 7.80073 7.80073 7.80073 ZT20-23 7.6012949999999995 7.6012949999999995 7.6012949999999995