condition mean min max ZT0-3 120.695838 120.695838 120.695838 ZT4-7 143.83325200000002 143.83325200000002 143.83325200000002 ZT8-11 157.8569025 157.8569025 157.8569025 ZT12-15 122.077483 122.077483 122.077483 ZT16-19 164.17443350000002 164.17443350000002 164.17443350000002 ZT20-23 164.07609050000002 164.07609050000002 164.07609050000002