condition mean min max ZT0-3 5.765738333333333 5.134505 6.81407 ZT4-7 4.573535 4.573535 4.573535 ZT8-11 4.53357 4.53357 4.53357 ZT12-15 8.815595 8.12448 9.50671 ZT16-19 9.49621 9.49621 9.49621 ZT20-23 7.98677 7.98677 7.98677