condition mean min max ZT0-3 28.7143 28.23805 29.19055 ZT4-7 19.90935 19.90935 19.90935 ZT8-11 20.9242 20.9242 20.9242 ZT12-15 0 0 0 ZT16-19 37.110549999999996 37.110549999999996 37.110549999999996 ZT20-23 32.974599999999995 32.974599999999995 32.974599999999995