condition mean min max ZT0-3 3128.8999999999996 3128.8999999999996 3128.8999999999996 ZT4-7 3390.7 3390.7 3390.7 ZT8-11 3317.55 3317.55 3317.55 ZT12-15 2844.55 2844.55 2844.55 ZT16-19 2949.55 2949.55 2949.55 ZT20-23 2856.45 2856.45 2856.45