condition mean min max ZT0-3 0.8177008333333333 0.5338085 1.2625865 ZT4-7 0.702366 0.702366 0.702366 ZT8-11 0.40360799999999997 0.40360799999999997 0.40360799999999997 ZT12-15 0.766436 0.734999 0.797873 ZT16-19 0.920643 0.920643 0.920643 ZT20-23 1.073186 1.073186 1.073186