condition mean min max ZT0-3 1.0398096145 0.195176337 1.884442892 ZT4-7 4.6185979405 3.8532464895 5.3839493915 ZT8-11 3.32909139925 3.1767269875 3.481455811 ZT12-15 3.845367297 2.7627058069999997 4.928028787000001 ZT16-19 4.820810562 3.944253647 5.697367477 ZT20-23 11.245791033 8.329535161 14.162046905