condition mean min max ZT0-3 13.18425 13.18425 13.18425 ZT4-7 7.339375 7.339375 7.339375 ZT8-11 12.6536 12.6536 12.6536 ZT12-15 12.220600000000001 12.220600000000001 12.220600000000001 ZT16-19 19.6343 19.6343 19.6343 ZT20-23 15.15595 15.15595 15.15595