condition mean min max ZT0-3 0.8068329999999999 0.8068329999999999 0.8068329999999999 ZT4-7 0.733967 0.733967 0.733967 ZT8-11 0.7475385 0.7475385 0.7475385 ZT12-15 0.6278485 0.6278485 0.6278485 ZT16-19 0.7286375 0.7286375 0.7286375 ZT20-23 0.758242 0.758242 0.758242