condition mean min max ZT0-3 17.389291405 15.16568452 19.61289829 ZT4-7 6.488753855000001 5.5070569835 7.470450726500001 ZT8-11 17.47372455575 6.337004804000001 28.6104443075 ZT12-15 47.8451212175 43.903891785 51.78635065 ZT16-19 44.5463054075 43.21522461 45.877386205 ZT20-23 29.09671347 27.53424158 30.659185360000002