condition mean min max ZT0-3 302.358849425 271.5178745 333.19982435 ZT4-7 257.11226485 236.89723145 277.32729825 ZT8-11 120.76927144 93.008070425 148.530472455 ZT12-15 70.183907155 56.843276255 83.524538055 ZT16-19 130.0864948 125.9767619 134.1962277 ZT20-23 137.77844085 135.73195020000003 139.8249315