condition mean min max ZT0-3 930.479033 930.479033 930.479033 ZT4-7 1214.300485 1214.300485 1214.300485 ZT8-11 1465.944187 1465.944187 1465.944187 ZT12-15 1625.394883 1625.394883 1625.394883 ZT16-19 1856.7986055000001 1856.7986055000001 1856.7986055000001 ZT20-23 1388.569444 1388.569444 1388.569444