condition mean min max ZT0-3 3.8857574999999995 3.42751 4.344004999999999 ZT4-7 2.42184 2.42184 2.42184 ZT8-11 1.563045 1.563045 1.563045 ZT12-15 0 0 0 ZT16-19 1.0873650000000001 1.0873650000000001 1.0873650000000001 ZT20-23 1.282815 1.282815 1.282815