condition mean min max ZT0-3 1910.937293 1910.937293 1910.937293 ZT4-7 1549.2747795 1549.2747795 1549.2747795 ZT8-11 884.711511 884.711511 884.711511 ZT12-15 942.321079 942.321079 942.321079 ZT16-19 1308.2954535 1308.2954535 1308.2954535 ZT20-23 1783.505771 1783.505771 1783.505771