condition mean min max ZT0-3 4.16362917725 3.6592447260000003 4.6680136285 ZT4-7 4.3577029245 4.0502870725 4.6651187765 ZT8-11 6.701542187749999 4.393054297999999 9.0100300775 ZT12-15 23.730662493249998 20.635130066499997 26.82619492 ZT16-19 18.11139816 16.700275235 19.522521085 ZT20-23 11.6447440125 11.0940781 12.195409925