condition mean min max ZT0-3 12.569025 12.569025 12.569025 ZT4-7 11.0506515 11.0506515 11.0506515 ZT8-11 10.11065 10.11065 10.11065 ZT12-15 9.3441865 9.3441865 9.3441865 ZT16-19 10.413291000000001 10.413291000000001 10.413291000000001 ZT20-23 10.564837 10.564837 10.564837