condition mean min max ZT0-3 539.441443 539.441443 539.441443 ZT4-7 294.1177335 294.1177335 294.1177335 ZT8-11 303.9272755 303.9272755 303.9272755 ZT12-15 362.30898 362.30898 362.30898 ZT16-19 1097.0566355 1097.0566355 1097.0566355 ZT20-23 711.4372814999999 711.4372814999999 711.4372814999999