condition mean min max ZT0-3 1.41734 1.41734 1.41734 ZT4-7 1.24181 1.24181 1.24181 ZT8-11 1.5963500000000002 1.5963500000000002 1.5963500000000002 ZT12-15 1.6195249999999999 1.6195249999999999 1.6195249999999999 ZT16-19 2.3658200000000003 2.3658200000000003 2.3658200000000003 ZT20-23 1.640385 1.640385 1.640385