condition mean min max ZT0-3 1374.392474 1374.392474 1374.392474 ZT4-7 1297.0751384999999 1297.0751384999999 1297.0751384999999 ZT8-11 1486.136477 1486.136477 1486.136477 ZT12-15 1459.523234 1459.523234 1459.523234 ZT16-19 4722.779802499999 4722.779802499999 4722.779802499999 ZT20-23 6662.53205 6662.53205 6662.53205