condition mean min max ZT0-3 10.829067 10.829067 10.829067 ZT4-7 11.1399575 11.1399575 11.1399575 ZT8-11 10.232644 10.232644 10.232644 ZT12-15 12.3800995 12.3800995 12.3800995 ZT16-19 10.936886 10.936886 10.936886 ZT20-23 13.6287725 13.6287725 13.6287725