condition mean min max ZT0-3 38.280597 38.280597 38.280597 ZT4-7 34.549989 34.549989 34.549989 ZT8-11 34.1387865 34.1387865 34.1387865 ZT12-15 39.985714 39.985714 39.985714 ZT16-19 52.6518485 52.6518485 52.6518485 ZT20-23 46.831323499999996 46.831323499999996 46.831323499999996