condition mean min max ZT0-3 13.5112125 10.459525 16.5629 ZT4-7 14.470099999999999 14.470099999999999 14.470099999999999 ZT8-11 14.11485 14.11485 14.11485 ZT12-15 0 0 0 ZT16-19 15.02125 15.02125 15.02125 ZT20-23 19.89375 19.89375 19.89375