condition mean min max ZT0-3 13.689813 13.689813 13.689813 ZT4-7 13.4003655 13.4003655 13.4003655 ZT8-11 12.8060105 12.8060105 12.8060105 ZT12-15 12.623548 12.623548 12.623548 ZT16-19 11.5706505 11.5706505 11.5706505 ZT20-23 13.6086935 13.6086935 13.6086935