condition mean min max ZT0-3 20.448275 20.448275 20.448275 ZT4-7 14.326461 14.326461 14.326461 ZT8-11 12.2821115 12.2821115 12.2821115 ZT12-15 12.099936 12.099936 12.099936 ZT16-19 12.1267605 12.1267605 12.1267605 ZT20-23 12.825807999999999 12.825807999999999 12.825807999999999