condition mean min max ZT0-3 1.1174300000000001 1.1174300000000001 1.1174300000000001 ZT4-7 0.9543740000000001 0.9543740000000001 0.9543740000000001 ZT8-11 0.5556525 0.5556525 0.5556525 ZT12-15 0.372974 0.372974 0.372974 ZT16-19 0.9181954999999999 0.9181954999999999 0.9181954999999999 ZT20-23 0.6501855 0.6501855 0.6501855