condition mean min max ZT0-3 1.688205 1.688205 1.688205 ZT4-7 1.2227485 1.2227485 1.2227485 ZT8-11 1.532054 1.532054 1.532054 ZT12-15 1.294934 1.294934 1.294934 ZT16-19 0.8561175000000001 0.8561175000000001 0.8561175000000001 ZT20-23 1.27221 1.27221 1.27221