condition mean min max ZT0-3 228.86866666666666 173.707 334.16499999999996 ZT4-7 461.23850000000004 461.23850000000004 461.23850000000004 ZT8-11 668.2645 668.2645 668.2645 ZT12-15 445.26399999999995 370.29999999999995 520.228 ZT16-19 268.385 268.385 268.385 ZT20-23 204.5685 204.5685 204.5685