condition mean min max ZT0-3 210.617518 210.617518 210.617518 ZT4-7 331.51147449999996 331.51147449999996 331.51147449999996 ZT8-11 381.22125900000003 381.22125900000003 381.22125900000003 ZT12-15 514.403705 514.403705 514.403705 ZT16-19 360.14691500000004 360.14691500000004 360.14691500000004 ZT20-23 400.7932905 400.7932905 400.7932905