condition mean min max ZT0-3 1.3537778354999999 1.279102063 1.4284536079999999 ZT4-7 0.8769087712500001 0.7943810545000001 0.959436488 ZT8-11 0.29202056425 0.2311413055 0.352899823 ZT12-15 0.63070312575 0.379699554 0.8817066975000001 ZT16-19 1.12185649675 1.0455288195 1.1981841739999999 ZT20-23 1.775938518 1.7442569335 1.8076201025