condition mean min max ZT0-3 0.9672660000000001 0.9672660000000001 0.9672660000000001 ZT4-7 1.1295565 1.1295565 1.1295565 ZT8-11 0.5282875 0.5282875 0.5282875 ZT12-15 1.0769065 1.0769065 1.0769065 ZT16-19 0.7680843333333334 0.7680843333333334 0.7680843333333334 ZT20-23 0.740278 0.740278 0.740278