condition mean min max ZT0-3 1.1746044235 0.364527814 1.984681033 ZT4-7 3.91027125225 3.5990555375 4.221486967 ZT8-11 5.77194694025 4.4621926485 7.0817012319999995 ZT12-15 9.679483081 9.3076190895 10.0513470725 ZT16-19 9.006935147 8.355029001 9.658841293 ZT20-23 5.343532281000001 4.740595235500001 5.946469326500001