condition mean min max ZT0-3 3.4411416666666663 3.07095 3.71439 ZT4-7 2.81176 2.81176 2.81176 ZT8-11 2.89283 2.89283 2.89283 ZT12-15 5.116327500000001 4.950245000000001 5.2824100000000005 ZT16-19 3.111055 3.111055 3.111055 ZT20-23 3.7357699999999996 3.7357699999999996 3.7357699999999996