condition mean min max ZT0-3 486.91961 486.91961 486.91961 ZT4-7 446.70750350000003 446.70750350000003 446.70750350000003 ZT8-11 482.23247349999997 482.23247349999997 482.23247349999997 ZT12-15 541.475392 541.475392 541.475392 ZT16-19 538.7394785 538.7394785 538.7394785 ZT20-23 504.2588045 504.2588045 504.2588045