condition mean min max ZT0-3 142.8677778 142.8677778 142.8677778 ZT4-7 156.29999999999998 156.29999999999998 156.29999999999998 ZT8-11 128.10333332333335 128.10333332333335 128.10333332333335 ZT12-15 198.20888889000003 198.20888889000003 198.20888889000003 ZT16-19 189.56000000999998 189.56000000999998 189.56000000999998 ZT20-23 148.72555554333331 148.72555554333331 148.72555554333331