condition mean min max ZT0-3 61.077477 61.077477 61.077477 ZT4-7 35.145917499999996 35.145917499999996 35.145917499999996 ZT8-11 37.496204 37.496204 37.496204 ZT12-15 60.790809499999995 60.790809499999995 60.790809499999995 ZT16-19 77.6521375 77.6521375 77.6521375 ZT20-23 75.3820565 75.3820565 75.3820565