condition mean min max ZT0-3 195.63218 195.63218 195.63218 ZT4-7 808.596976 808.596976 808.596976 ZT8-11 759.6611889999999 759.6611889999999 759.6611889999999 ZT12-15 1509.8049290000001 1509.8049290000001 1509.8049290000001 ZT16-19 298.967832 298.967832 298.967832 ZT20-23 545.6582705 545.6582705 545.6582705