condition mean min max ZT0-3 8.27528 8.27528 8.27528 ZT4-7 7.977805 7.977805 7.977805 ZT8-11 8.953975 8.953975 8.953975 ZT12-15 10.087405 10.087405 10.087405 ZT16-19 11.6656 11.6656 11.6656 ZT20-23 10.461599999999999 10.461599999999999 10.461599999999999