condition mean min max ZT0-3 2.7898949999999996 2.56188 3.0179099999999996 ZT4-7 3.060415 3.060415 3.060415 ZT8-11 4.32491 4.32491 4.32491 ZT12-15 0 0 0 ZT16-19 5.0449649999999995 5.0449649999999995 5.0449649999999995 ZT20-23 3.8964999999999996 3.8964999999999996 3.8964999999999996