condition mean min max ZT0-3 152.519398 152.519398 152.519398 ZT4-7 200.2726035 200.2726035 200.2726035 ZT8-11 187.277337 187.277337 187.277337 ZT12-15 240.7869885 240.7869885 240.7869885 ZT16-19 191.89061850000002 191.89061850000002 191.89061850000002 ZT20-23 146.7645425 146.7645425 146.7645425