condition mean min max ZT0-3 659.75 659.75 659.75 ZT4-7 311.0 311.0 311.0 ZT8-11 373.9 373.9 373.9 ZT12-15 866.55 866.55 866.55 ZT16-19 1134.8000000000002 1134.8000000000002 1134.8000000000002 ZT20-23 1218.6 1218.6 1218.6