condition mean min max ZT0-3 326.770518 326.770518 326.770518 ZT4-7 363.547593 363.547593 363.547593 ZT8-11 364.30136000000005 364.30136000000005 364.30136000000005 ZT12-15 390.550455 390.550455 390.550455 ZT16-19 383.6772555 383.6772555 383.6772555 ZT20-23 385.3476555 385.3476555 385.3476555