condition mean min max ZT0-3 1.07482275 0.9665604999999999 1.183085 ZT4-7 0.2007335 0.2007335 0.2007335 ZT8-11 0.2005395 0.2005395 0.2005395 ZT12-15 0 0 0 ZT16-19 0.3884975 0.3884975 0.3884975 ZT20-23 0.3896865 0.3896865 0.3896865