condition mean min max ZT0-3 23.385625 21.798250000000003 24.973 ZT4-7 20.02735 20.02735 20.02735 ZT8-11 22.453850000000003 22.453850000000003 22.453850000000003 ZT12-15 0 0 0 ZT16-19 28.62975 28.62975 28.62975 ZT20-23 26.58745 26.58745 26.58745