condition mean min max ZT0-3 1.395566245 1.29884675 1.49228574 ZT4-7 0.8389939742500001 0.7494786875 0.9285092610000001 ZT8-11 0.39613308924999996 0.23703859949999997 0.555227579 ZT12-15 1.4227666607499998 1.0176095175 1.8279238039999999 ZT16-19 1.3514883927499999 0.7769433035 1.9260334819999998 ZT20-23 1.588481953 1.4811572320000002 1.695806674