condition mean min max ZT0-3 438.484874 438.484874 438.484874 ZT4-7 488.6038 488.6038 488.6038 ZT8-11 612.972894 612.972894 612.972894 ZT12-15 551.4788080000001 551.4788080000001 551.4788080000001 ZT16-19 716.6065685 716.6065685 716.6065685 ZT20-23 662.9304155 662.9304155 662.9304155