condition mean min max ZT0-3 10.726398 10.726398 10.726398 ZT4-7 13.5956475 13.5956475 13.5956475 ZT8-11 11.24635 11.24635 11.24635 ZT12-15 11.9568995 11.9568995 11.9568995 ZT16-19 11.805043 11.805043 11.805043 ZT20-23 12.383058 12.383058 12.383058