condition mean min max ZT0-3 0.53961025 0.41268099999999996 0.6665395000000001 ZT4-7 0.3824385 0.3824385 0.3824385 ZT8-11 0.6364205000000001 0.6364205000000001 0.6364205000000001 ZT12-15 0 0 0 ZT16-19 0.6975775 0.6975775 0.6975775 ZT20-23 0.5004055000000001 0.5004055000000001 0.5004055000000001