condition mean min max ZT0-3 2.3588016666666665 1.815845 2.74127 ZT4-7 1.088115 1.088115 1.088115 ZT8-11 0.6156175 0.6156175 0.6156175 ZT12-15 2.9295525 2.386335 3.47277 ZT16-19 4.699325 4.699325 4.699325 ZT20-23 3.79023 3.79023 3.79023