condition mean min max ZT0-3 22.829250000000002 22.8158 22.8427 ZT4-7 21.4361 21.4361 21.4361 ZT8-11 17.687350000000002 17.687350000000002 17.687350000000002 ZT12-15 0 0 0 ZT16-19 27.75365 27.75365 27.75365 ZT20-23 24.29285 24.29285 24.29285