condition mean min max ZT0-3 11.136944 11.136944 11.136944 ZT4-7 9.5040145 9.5040145 9.5040145 ZT8-11 9.9469645 9.9469645 9.9469645 ZT12-15 11.372788 11.372788 11.372788 ZT16-19 9.743174 9.743174 9.743174 ZT20-23 9.243228 9.243228 9.243228