condition mean min max ZT0-3 30.185944 30.185944 30.185944 ZT4-7 44.2353235 44.2353235 44.2353235 ZT8-11 57.062093000000004 57.062093000000004 57.062093000000004 ZT12-15 43.556312500000004 43.556312500000004 43.556312500000004 ZT16-19 35.8541545 35.8541545 35.8541545 ZT20-23 35.5851545 35.5851545 35.5851545