condition mean min max ZT0-3 1214.653541 1214.653541 1214.653541 ZT4-7 1134.1361205 1134.1361205 1134.1361205 ZT8-11 962.247879 962.247879 962.247879 ZT12-15 1073.393148 1073.393148 1073.393148 ZT16-19 853.1674095000001 853.1674095000001 853.1674095000001 ZT20-23 631.527561 631.527561 631.527561