condition mean min max ZT0-3 228.30898 228.30898 228.30898 ZT4-7 250.0301325 250.0301325 250.0301325 ZT8-11 198.452143 198.452143 198.452143 ZT12-15 321.28680299999996 321.28680299999996 321.28680299999996 ZT16-19 350.41301999999996 350.41301999999996 350.41301999999996 ZT20-23 401.6691155 401.6691155 401.6691155