condition mean min max ZT0-3 6.892656618 3.537269901 10.248043335 ZT4-7 16.087621452500002 15.440358660000001 16.734884245 ZT8-11 18.172316465 15.702885235 20.641747695 ZT12-15 31.5470529425 28.93954489 34.154560995 ZT16-19 33.798871972499995 33.280865809999995 34.316878135 ZT20-23 31.4826666175 29.280239555 33.68509368