condition mean min max ZT0-3 37.34135 36.1451 38.5376 ZT4-7 30.57555 30.57555 30.57555 ZT8-11 30.0629 30.0629 30.0629 ZT12-15 0 0 0 ZT16-19 26.7332 26.7332 26.7332 ZT20-23 43.347049999999996 43.347049999999996 43.347049999999996