condition mean min max ZT0-3 12.36016 12.36016 12.36016 ZT4-7 12.4569065 12.4569065 12.4569065 ZT8-11 12.425324 12.425324 12.425324 ZT12-15 12.915721 12.915721 12.915721 ZT16-19 12.9866035 12.9866035 12.9866035 ZT20-23 13.123763499999999 13.123763499999999 13.123763499999999