condition mean min max ZT0-3 212.828196 212.828196 212.828196 ZT4-7 448.351628 448.351628 448.351628 ZT8-11 443.8134085 443.8134085 443.8134085 ZT12-15 451.363736 451.363736 451.363736 ZT16-19 291.94066699999996 291.94066699999996 291.94066699999996 ZT20-23 268.53774699999997 268.53774699999997 268.53774699999997