condition mean min max ZT0-3 5.9539525 5.57194 6.335965 ZT4-7 6.903824999999999 6.903824999999999 6.903824999999999 ZT8-11 9.43048 9.43048 9.43048 ZT12-15 0 0 0 ZT16-19 9.367925 9.367925 9.367925 ZT20-23 8.807865 8.807865 8.807865