condition mean min max ZT0-3 15.663284 15.663284 15.663284 ZT4-7 16.090103 16.090103 16.090103 ZT8-11 15.658902000000001 15.658902000000001 15.658902000000001 ZT12-15 17.3506285 17.3506285 17.3506285 ZT16-19 13.410284 13.410284 13.410284 ZT20-23 15.663284 15.663284 15.663284