condition mean min max ZT0-3 9.26906 9.26906 9.26906 ZT4-7 10.135912000000001 10.135912000000001 10.135912000000001 ZT8-11 8.670086000000001 8.670086000000001 8.670086000000001 ZT12-15 9.492015 9.492015 9.492015 ZT16-19 7.54669 7.54669 7.54669 ZT20-23 6.9103069999999995 6.9103069999999995 6.9103069999999995