condition mean min max ZT0-3 1.092975 1.092975 1.092975 ZT4-7 0.6292420000000001 0.6292420000000001 0.6292420000000001 ZT8-11 1.0080485 1.0080485 1.0080485 ZT12-15 1.319465 1.319465 1.319465 ZT16-19 1.6991450000000001 1.6991450000000001 1.6991450000000001 ZT20-23 1.43541 1.43541 1.43541