condition mean min max ZT0-3 9.1282225 8.579305 9.67714 ZT4-7 12.472249999999999 12.472249999999999 12.472249999999999 ZT8-11 10.86225 10.86225 10.86225 ZT12-15 0 0 0 ZT16-19 12.555800000000001 12.555800000000001 12.555800000000001 ZT20-23 11.751850000000001 11.751850000000001 11.751850000000001