condition mean min max ZT0-3 19.72325 19.72325 19.72325 ZT4-7 18.023600000000002 18.023600000000002 18.023600000000002 ZT8-11 21.003 21.003 21.003 ZT12-15 16.75435 16.75435 16.75435 ZT16-19 22.603 22.603 22.603 ZT20-23 17.2314 17.2314 17.2314