condition mean min max ZT0-3 1334.662503 1334.662503 1334.662503 ZT4-7 1435.883894 1435.883894 1435.883894 ZT8-11 1219.35351 1219.35351 1219.35351 ZT12-15 1333.8027115 1333.8027115 1333.8027115 ZT16-19 1065.4486115 1065.4486115 1065.4486115 ZT20-23 987.2108395 987.2108395 987.2108395