condition mean min max ZT0-3 63.102016666666664 54.77365 67.3034 ZT4-7 53.761399999999995 53.761399999999995 53.761399999999995 ZT8-11 44.95105 44.95105 44.95105 ZT12-15 43.8911 42.887100000000004 44.8951 ZT16-19 45.942099999999996 45.942099999999996 45.942099999999996 ZT20-23 69.17345 69.17345 69.17345