condition mean min max ZT0-3 0.8860126666666667 0.726997 1.102225 ZT4-7 0.490187 0.490187 0.490187 ZT8-11 0.7444689999999999 0.7444689999999999 0.7444689999999999 ZT12-15 0.88752075 0.8085795 0.966462 ZT16-19 0.8682000000000001 0.8682000000000001 0.8682000000000001 ZT20-23 1.0414635 1.0414635 1.0414635