condition mean min max ZT0-3 6.024051666666666 4.95548 6.783894999999999 ZT4-7 3.545495 3.545495 3.545495 ZT8-11 5.45247 5.45247 5.45247 ZT12-15 4.6469225 3.72055 5.573295 ZT16-19 2.871505 2.871505 2.871505 ZT20-23 5.740575 5.740575 5.740575