condition mean min max ZT0-3 7.3187549999999995 6.89381 7.7437 ZT4-7 4.7668099999999995 4.7668099999999995 4.7668099999999995 ZT8-11 4.77527 4.77527 4.77527 ZT12-15 0 0 0 ZT16-19 6.430680000000001 6.430680000000001 6.430680000000001 ZT20-23 5.158715000000001 5.158715000000001 5.158715000000001