condition mean min max ZT0-3 20.924733333333332 16.9656 24.3956 ZT4-7 18.49805 18.49805 18.49805 ZT8-11 18.6314 18.6314 18.6314 ZT12-15 29.31245 28.1615 30.4634 ZT16-19 24.20415 24.20415 24.20415 ZT20-23 28.44295 28.44295 28.44295