condition mean min max ZT0-3 8.111513333333335 7.35137 8.929680000000001 ZT4-7 3.339325 3.339325 3.339325 ZT8-11 4.999625 4.999625 4.999625 ZT12-15 10.4385025 9.646905 11.2301 ZT16-19 14.21685 14.21685 14.21685 ZT20-23 14.74145 14.74145 14.74145