condition mean min max ZT0-3 1.8739050000000002 1.8739050000000002 1.8739050000000002 ZT4-7 1.193295 1.193295 1.193295 ZT8-11 1.24884 1.24884 1.24884 ZT12-15 1.15862 1.15862 1.15862 ZT16-19 1.706885 1.706885 1.706885 ZT20-23 1.80167 1.80167 1.80167