condition mean min max ZT0-3 10.391312 10.391312 10.391312 ZT4-7 9.5580505 9.5580505 9.5580505 ZT8-11 9.637952 9.637952 9.637952 ZT12-15 10.3701905 10.3701905 10.3701905 ZT16-19 9.34345 9.34345 9.34345 ZT20-23 9.858384000000001 9.858384000000001 9.858384000000001