condition mean min max ZT0-3 1.4756798237500002 0.639551031 2.3118086165000005 ZT4-7 1.72003888175 1.4630365715 1.9770411920000002 ZT8-11 1.3246369372499998 1.3227407534999998 1.326533121 ZT12-15 0.48022081725 0.283649313 0.6767923215 ZT16-19 0.08647532825 0.023334952000000003 0.1496157045 ZT20-23 0.117647705 0.086710439 0.148584971