condition mean min max ZT0-3 131.0 131.0 131.0 ZT4-7 143.7 143.7 143.7 ZT8-11 85.5 85.5 85.5 ZT12-15 116.0 116.0 116.0 ZT16-19 134.39999999999998 134.39999999999998 134.39999999999998 ZT20-23 112.30000000000001 112.30000000000001 112.30000000000001