condition mean min max ZT0-3 538.461012 538.461012 538.461012 ZT4-7 723.3517214999999 723.3517214999999 723.3517214999999 ZT8-11 833.299246 833.299246 833.299246 ZT12-15 856.4119705 856.4119705 856.4119705 ZT16-19 634.295235 634.295235 634.295235 ZT20-23 521.2091095000001 521.2091095000001 521.2091095000001