condition mean min max ZT0-3 23.12225 23.12225 23.12225 ZT4-7 20.79585 20.79585 20.79585 ZT8-11 21.557850000000002 21.557850000000002 21.557850000000002 ZT12-15 23.17955 23.17955 23.17955 ZT16-19 25.19 25.19 25.19 ZT20-23 22.9735 22.9735 22.9735