condition mean min max ZT0-3 241.099407 241.099407 241.099407 ZT4-7 243.7310695 243.7310695 243.7310695 ZT8-11 157.3162095 157.3162095 157.3162095 ZT12-15 145.548438 145.548438 145.548438 ZT16-19 104.67929649999999 104.67929649999999 104.67929649999999 ZT20-23 74.3640305 74.3640305 74.3640305