condition mean min max ZT0-3 248.640635 248.640635 248.640635 ZT4-7 228.269966 228.269966 228.269966 ZT8-11 215.139406 215.139406 215.139406 ZT12-15 185.66221050000001 185.66221050000001 185.66221050000001 ZT16-19 197.515707 197.515707 197.515707 ZT20-23 190.83081199999998 190.83081199999998 190.83081199999998