condition mean min max ZT0-3 9.188622 9.188622 9.188622 ZT4-7 11.0574105 11.0574105 11.0574105 ZT8-11 11.3270965 11.3270965 11.3270965 ZT12-15 10.747726 10.747726 10.747726 ZT16-19 9.614633999999999 9.614633999999999 9.614633999999999 ZT20-23 10.5990815 10.5990815 10.5990815