condition mean min max ZT0-3 12.087033333333334 12.087033333333334 12.087033333333334 ZT4-7 12.206714999999999 12.206714999999999 12.206714999999999 ZT8-11 11.09633 11.09633 11.09633 ZT12-15 14.399000000000001 14.399000000000001 14.399000000000001 ZT16-19 12.9253 12.9253 12.9253 ZT20-23 17.9228 17.9228 17.9228