condition mean min max ZT0-3 0.082795012 0.0 0.165590024 ZT4-7 0.2158128845 0.1059538755 0.3256718935 ZT8-11 1.9244896787499997 1.3428076434999998 2.5061717139999997 ZT12-15 2.9567416997500002 2.7802607485 3.133222651 ZT16-19 3.894282107 3.6306586275 4.1579055865 ZT20-23 4.97958558725 3.8816767565 6.077494418