condition mean min max ZT0-3 8.465254999999999 7.781454999999999 8.916485 ZT4-7 7.80214 7.80214 7.80214 ZT8-11 9.38787 9.38787 9.38787 ZT12-15 12.5413 12.42745 12.655149999999999 ZT16-19 7.886564999999999 7.886564999999999 7.886564999999999 ZT20-23 10.388415 10.388415 10.388415