condition mean min max ZT0-3 5.15652 3.90506 6.09529 ZT4-7 4.03956 4.03956 4.03956 ZT8-11 2.93239 2.93239 2.93239 ZT12-15 3.8179575000000003 2.7916600000000003 4.844255 ZT16-19 3.818145 3.818145 3.818145 ZT20-23 4.143800000000001 4.143800000000001 4.143800000000001