condition mean min max ZT0-3 5.0499624999999995 4.7578949999999995 5.34203 ZT4-7 2.68263 2.68263 2.68263 ZT8-11 3.713005 3.713005 3.713005 ZT12-15 0 0 0 ZT16-19 5.425795000000001 5.425795000000001 5.425795000000001 ZT20-23 4.378909999999999 4.378909999999999 4.378909999999999