condition mean min max ZT0-3 1865.6345385 1635.697073 2095.572004 ZT4-7 332.65621225 326.39569425 338.91673025 ZT8-11 663.7315553 451.96598639999996 875.4971241999999 ZT12-15 276.79832868750003 34.459432930000006 519.137224445 ZT16-19 39.555382745 38.884920485 40.225845005 ZT20-23 37.4063595475 34.200273134999996 40.61244596