condition mean min max ZT0-3 1.1700506666666666 0.8313780000000001 1.8434849999999998 ZT4-7 2.428285 2.428285 2.428285 ZT8-11 1.383159 1.383159 1.383159 ZT12-15 2.0071642499999998 1.0024235 3.011905 ZT16-19 0.782984 0.782984 0.782984 ZT20-23 0.29625250000000003 0.29625250000000003 0.29625250000000003