condition mean min max ZT0-3 6.3903125 6.35573 6.424894999999999 ZT4-7 7.188435 7.188435 7.188435 ZT8-11 1.792095 1.792095 1.792095 ZT12-15 0 0 0 ZT16-19 3.3835249999999997 3.3835249999999997 3.3835249999999997 ZT20-23 7.534165 7.534165 7.534165