condition mean min max ZT0-3 31.643655562499998 28.063457624999998 35.2238535 ZT4-7 35.879473005 29.82442919 41.93451682 ZT8-11 50.9555564575 41.63105835 60.280054565 ZT12-15 42.3071842275 35.16175623 49.452612224999996 ZT16-19 39.505755835 39.063893945000004 39.947617725 ZT20-23 45.753445905 43.41435661 48.0925352