condition mean min max ZT0-3 0.6337559245 0.40332047 0.864191379 ZT4-7 2.5907732042499996 1.3563992324999998 3.8251471759999998 ZT8-11 14.04973513225 8.7075129795 19.391957285 ZT12-15 17.631704016249998 17.3503867875 17.913021245 ZT16-19 6.3595966075 5.333869356000001 7.385323859 ZT20-23 3.482008511 3.3625884875 3.6014285345