condition mean min max ZT0-3 6.154185 6.154185 6.154185 ZT4-7 3.731855 3.731855 3.731855 ZT8-11 2.098315 2.098315 2.098315 ZT12-15 4.5093049999999995 4.5093049999999995 4.5093049999999995 ZT16-19 14.60723 14.60723 14.60723 ZT20-23 8.22436 8.22436 8.22436