condition mean min max ZT0-3 17.82415 14.159400000000002 21.5703 ZT4-7 16.7586 16.7586 16.7586 ZT8-11 17.42355 17.42355 17.42355 ZT12-15 32.133300000000006 31.018250000000002 33.24835 ZT16-19 29.7473 29.7473 29.7473 ZT20-23 36.35745 36.35745 36.35745