condition mean min max ZT0-3 176.385903 176.385903 176.385903 ZT4-7 193.8613715 193.8613715 193.8613715 ZT8-11 246.76427 246.76427 246.76427 ZT12-15 288.12881400000003 288.12881400000003 288.12881400000003 ZT16-19 198.8337325 198.8337325 198.8337325 ZT20-23 176.5725645 176.5725645 176.5725645