condition mean min max ZT0-3 6.81932520575 3.7810407010000002 9.8576097105 ZT4-7 16.33636712 14.49994559 18.17278865 ZT8-11 23.617788205 20.709315075 26.526261335 ZT12-15 24.3164723875 24.23372912 24.399215655 ZT16-19 24.7673582975 22.719591025 26.81512557 ZT20-23 23.177053190000002 23.10423866 23.24986772