condition mean min max ZT0-3 26.7607801275 23.36855967 30.153000585 ZT4-7 28.9642958225 28.472351935 29.45623971 ZT8-11 30.83972385 28.813410034999997 32.866037665 ZT12-15 25.820813414999996 24.921146219999997 26.72048061 ZT16-19 34.8204347025 33.475158565 36.16571084 ZT20-23 36.016370675000005 35.88311197 36.14962938