condition mean min max ZT0-3 13.09721 13.09721 13.09721 ZT4-7 20.261163 20.261163 20.261163 ZT8-11 21.152797 21.152797 21.152797 ZT12-15 24.4468745 24.4468745 24.4468745 ZT16-19 18.5324495 18.5324495 18.5324495 ZT20-23 17.035653000000003 17.035653000000003 17.035653000000003