condition mean min max ZT0-3 5.22132 5.1093 5.33334 ZT4-7 7.68262 7.68262 7.68262 ZT8-11 8.34555 8.34555 8.34555 ZT12-15 0 0 0 ZT16-19 6.184425 6.184425 6.184425 ZT20-23 8.155565 8.155565 8.155565