condition mean min max ZT0-3 0.4438321667499999 0.204949114 0.6827152194999999 ZT4-7 1.0148503475 0.8398058405 1.1898948544999999 ZT8-11 3.36637152275 1.9350999445000001 4.797643101 ZT12-15 8.91187751975 7.258604780999999 10.5651502585 ZT16-19 6.57645157 6.016013063 7.136890077 ZT20-23 3.994903606 3.48584957 4.503957642