condition mean min max ZT0-3 46.732675 39.90245 53.5629 ZT4-7 31.7804 31.7804 31.7804 ZT8-11 29.473300000000002 29.473300000000002 29.473300000000002 ZT12-15 0 0 0 ZT16-19 28.3508 28.3508 28.3508 ZT20-23 35.075649999999996 35.075649999999996 35.075649999999996