condition mean min max ZT0-3 5.89886 2.8416050000000004 11.53805 ZT4-7 9.607389999999999 9.607389999999999 9.607389999999999 ZT8-11 13.1263 13.1263 13.1263 ZT12-15 15.097125000000002 14.877600000000001 15.316650000000001 ZT16-19 7.984315 7.984315 7.984315 ZT20-23 8.453299999999999 8.453299999999999 8.453299999999999