condition mean min max ZT0-3 8.57292 8.57292 8.57292 ZT4-7 4.57861 4.57861 4.57861 ZT8-11 5.08567 5.08567 5.08567 ZT12-15 7.42271 7.42271 7.42271 ZT16-19 10.619675 10.619675 10.619675 ZT20-23 10.33025 10.33025 10.33025