condition mean min max ZT0-3 5.84574761925 5.0147639045000005 6.676731333999999 ZT4-7 2.9797946235 2.973434261 2.986154986 ZT8-11 2.24701513075 2.110914244 2.3831160175 ZT12-15 3.0023281744999997 2.6995578164999996 3.3050985324999997 ZT16-19 5.6550708465 4.8534451885 6.4566965045 ZT20-23 7.75385080175 7.3040564135 8.20364519