condition mean min max ZT0-3 8.5315725 8.50512 8.558025 ZT4-7 10.101435 10.101435 10.101435 ZT8-11 13.0921 13.0921 13.0921 ZT12-15 0 0 0 ZT16-19 16.4022 16.4022 16.4022 ZT20-23 14.04575 14.04575 14.04575