condition mean min max ZT0-3 630.155134 630.155134 630.155134 ZT4-7 571.108097 571.108097 571.108097 ZT8-11 487.45975599999997 487.45975599999997 487.45975599999997 ZT12-15 492.6661365 492.6661365 492.6661365 ZT16-19 410.238001 410.238001 410.238001 ZT20-23 551.865219 551.865219 551.865219