condition mean min max ZT0-3 15.65195 15.65195 15.65195 ZT4-7 12.558800000000002 12.558800000000002 12.558800000000002 ZT8-11 13.005099999999999 13.005099999999999 13.005099999999999 ZT12-15 13.181049999999999 13.181049999999999 13.181049999999999 ZT16-19 17.589 17.589 17.589 ZT20-23 17.2262 17.2262 17.2262