condition mean min max ZT0-3 5.4169 5.4169 5.4169 ZT4-7 12.2454 12.2454 12.2454 ZT8-11 4.437495 4.437495 4.437495 ZT12-15 3.4540100000000002 3.4540100000000002 3.4540100000000002 ZT16-19 5.097355 5.097355 5.097355 ZT20-23 3.290485 3.290485 3.290485