condition mean min max ZT0-3 1.222275 1.222275 1.222275 ZT4-7 1.1353365 1.1353365 1.1353365 ZT8-11 0.985363 0.985363 0.985363 ZT12-15 0.7491295 0.7491295 0.7491295 ZT16-19 1.111565 1.111565 1.111565 ZT20-23 1.488805 1.488805 1.488805