condition mean min max ZT0-3 519.937044 519.937044 519.937044 ZT4-7 931.019651 931.019651 931.019651 ZT8-11 1210.5145345 1210.5145345 1210.5145345 ZT12-15 1192.5713365 1192.5713365 1192.5713365 ZT16-19 888.340074 888.340074 888.340074 ZT20-23 806.330793 806.330793 806.330793