condition mean min max ZT0-3 283.22813 283.22813 283.22813 ZT4-7 277.2589575 277.2589575 277.2589575 ZT8-11 216.698287 216.698287 216.698287 ZT12-15 206.99058150000002 206.99058150000002 206.99058150000002 ZT16-19 151.9970185 151.9970185 151.9970185 ZT20-23 134.5697625 134.5697625 134.5697625