condition mean min max ZT0-3 81.0264193925 74.505408725 87.54743006 ZT4-7 59.19112748 52.984445545 65.397809415 ZT8-11 56.0189635775 53.466258385 58.57166877 ZT12-15 23.559970640000003 15.178583435 31.941357845000002 ZT16-19 29.7507808325 24.88262301 34.618938655 ZT20-23 37.365292955 34.472187930000004 40.25839798