condition mean min max ZT0-3 0.772621 0.513057 1.0072990000000002 ZT4-7 0.2023965 0.2023965 0.2023965 ZT8-11 0.584215 0.584215 0.584215 ZT12-15 1.724195 1.4603549999999998 1.988035 ZT16-19 1.415545 1.415545 1.415545 ZT20-23 1.665705 1.665705 1.665705